diff --git a/src/citra_qt/debugger/callstack.h b/src/citra_qt/debugger/callstack.h
index 1a9b6dc816..7aa83db1e2 100644
--- a/src/citra_qt/debugger/callstack.h
+++ b/src/citra_qt/debugger/callstack.h
@@ -12,7 +12,7 @@ class CallstackWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    CallstackWidget(QWidget* parent = 0);
+    CallstackWidget(QWidget* parent = nullptr);
 
 public slots:
     void OnDebugModeEntered();
diff --git a/src/citra_qt/debugger/graphics.h b/src/citra_qt/debugger/graphics.h
index 8119b4c879..36b25b81db 100644
--- a/src/citra_qt/debugger/graphics.h
+++ b/src/citra_qt/debugger/graphics.h
@@ -37,7 +37,7 @@ class GPUCommandStreamWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    GPUCommandStreamWidget(QWidget* parent = 0);
+    GPUCommandStreamWidget(QWidget* parent = nullptr);
 
 private:
 };
diff --git a/src/citra_qt/debugger/graphics_cmdlists.h b/src/citra_qt/debugger/graphics_cmdlists.h
index 4859b6ec82..586cc72393 100644
--- a/src/citra_qt/debugger/graphics_cmdlists.h
+++ b/src/citra_qt/debugger/graphics_cmdlists.h
@@ -41,7 +41,7 @@ class GPUCommandListWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    GPUCommandListWidget(QWidget* parent = 0);
+    GPUCommandListWidget(QWidget* parent = nullptr);
 
 public slots:
     void OnToggleTracing();
diff --git a/src/citra_qt/debugger/profiler.h b/src/citra_qt/debugger/profiler.h
index 2199eaef1d..85c27a43e2 100644
--- a/src/citra_qt/debugger/profiler.h
+++ b/src/citra_qt/debugger/profiler.h
@@ -37,7 +37,7 @@ class ProfilerWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    ProfilerWidget(QWidget* parent = 0);
+    ProfilerWidget(QWidget* parent = nullptr);
 
 private slots:
     void setProfilingInfoUpdateEnabled(bool enable);
diff --git a/src/citra_qt/debugger/ramview.h b/src/citra_qt/debugger/ramview.h
index 18423036f0..0ef74586b9 100644
--- a/src/citra_qt/debugger/ramview.h
+++ b/src/citra_qt/debugger/ramview.h
@@ -9,7 +9,7 @@ class GRamView : public QHexEdit
     Q_OBJECT
 
 public:
-    GRamView(QWidget* parent = NULL);
+    GRamView(QWidget* parent = nullptr);
 
 public slots:
     void OnCPUStepped();
diff --git a/src/citra_qt/debugger/registers.h b/src/citra_qt/debugger/registers.h
index 09b830e80b..927fde1883 100644
--- a/src/citra_qt/debugger/registers.h
+++ b/src/citra_qt/debugger/registers.h
@@ -15,7 +15,7 @@ class RegistersWidget : public QDockWidget
     Q_OBJECT
 
 public:
-    RegistersWidget(QWidget* parent = NULL);
+    RegistersWidget(QWidget* parent = nullptr);
 
 public slots:
     void OnDebugModeEntered();
diff --git a/src/citra_qt/hotkeys.h b/src/citra_qt/hotkeys.h
index 2317f8188b..2fe6358829 100644
--- a/src/citra_qt/hotkeys.h
+++ b/src/citra_qt/hotkeys.h
@@ -47,7 +47,7 @@ class GHotkeysDialog : public QDialog
     Q_OBJECT
 
 public:
-    GHotkeysDialog(QWidget* parent = NULL);
+    GHotkeysDialog(QWidget* parent = nullptr);
 
 private:
     Ui::hotkeys ui;
diff --git a/src/core/arm/disassembler/arm_disasm.cpp b/src/core/arm/disassembler/arm_disasm.cpp
index 77af10b54c..76408e9fa8 100644
--- a/src/core/arm/disassembler/arm_disasm.cpp
+++ b/src/core/arm/disassembler/arm_disasm.cpp
@@ -206,7 +206,7 @@ static const char *opcode_names[] = {
     "swi",
     "tst",
 
-    NULL
+    nullptr
 };
 
 // Indexed by the shift type (bits 6-5)
@@ -399,7 +399,7 @@ std::string ARM_Disasm::Disassemble(u32 addr, u32 insn)
         default:
             return "Error";
     }
-    return NULL;
+    return nullptr;
 }
 
 std::string ARM_Disasm::DisassembleALU(Opcode opcode, u32 insn)
diff --git a/src/core/arm/skyeye_common/vfp/vfpdouble.cpp b/src/core/arm/skyeye_common/vfp/vfpdouble.cpp
index 47a9fe8043..857e6ce45d 100644
--- a/src/core/arm/skyeye_common/vfp/vfpdouble.cpp
+++ b/src/core/arm/skyeye_common/vfp/vfpdouble.cpp
@@ -299,7 +299,7 @@ static u32 vfp_double_fsqrt(ARMul_State* state, int dd, int unused, int dm, u32
         vdp = &vdd;
 
         if (tm & VFP_NAN)
-            ret = vfp_propagate_nan(vdp, &vdm, NULL, fpscr);
+            ret = vfp_propagate_nan(vdp, &vdm, nullptr, fpscr);
         else if (vdm.sign == 0) {
 sqrt_copy:
             vdp = &vdm;
@@ -700,26 +700,26 @@ static struct op fops_ext[] = {
     { vfp_double_fabs,   0 },                 //0x00000001 - FEXT_FABS
     { vfp_double_fneg,   0 },                 //0x00000002 - FEXT_FNEG
     { vfp_double_fsqrt,  0 },                 //0x00000003 - FEXT_FSQRT
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_double_fcmp,   OP_SCALAR },         //0x00000008 - FEXT_FCMP
     { vfp_double_fcmpe,  OP_SCALAR },         //0x00000009 - FEXT_FCMPE
     { vfp_double_fcmpz,  OP_SCALAR },         //0x0000000A - FEXT_FCMPZ
     { vfp_double_fcmpez, OP_SCALAR },         //0x0000000B - FEXT_FCMPEZ
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_double_fcvts,  OP_SCALAR|OP_DD },   //0x0000000F - FEXT_FCVT
     { vfp_double_fuito,  OP_SCALAR|OP_SM },   //0x00000010 - FEXT_FUITO
     { vfp_double_fsito,  OP_SCALAR|OP_SM },   //0x00000011 - FEXT_FSITO
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_double_ftoui,  OP_SCALAR|OP_SD },   //0x00000018 - FEXT_FTOUI
     { vfp_double_ftouiz, OP_SCALAR|OP_SD },   //0x00000019 - FEXT_FTOUIZ
     { vfp_double_ftosi,  OP_SCALAR|OP_SD },   //0x0000001A - FEXT_FTOSI
diff --git a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
index 0fb3c3bf1f..e47ad2760a 100644
--- a/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
+++ b/src/core/arm/skyeye_common/vfp/vfpsingle.cpp
@@ -341,7 +341,7 @@ static u32 vfp_single_fsqrt(ARMul_State* state, int sd, int unused, s32 m, u32 f
         vsp = &vsd;
 
         if (tm & VFP_NAN)
-            ret = vfp_propagate_nan(vsp, &vsm, NULL, fpscr);
+            ret = vfp_propagate_nan(vsp, &vsm, nullptr, fpscr);
         else if (vsm.sign == 0) {
 sqrt_copy:
             vsp = &vsm;
@@ -725,26 +725,26 @@ static struct op fops_ext[] = {
     { vfp_single_fabs,   0 },                 //0x00000001 - FEXT_FABS
     { vfp_single_fneg,   0 },                 //0x00000002 - FEXT_FNEG
     { vfp_single_fsqrt,  0 },                 //0x00000003 - FEXT_FSQRT
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_single_fcmp,   OP_SCALAR },         //0x00000008 - FEXT_FCMP
     { vfp_single_fcmpe,  OP_SCALAR },         //0x00000009 - FEXT_FCMPE
     { vfp_single_fcmpz,  OP_SCALAR },         //0x0000000A - FEXT_FCMPZ
     { vfp_single_fcmpez, OP_SCALAR },         //0x0000000B - FEXT_FCMPEZ
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_single_fcvtd,  OP_SCALAR|OP_DD },   //0x0000000F - FEXT_FCVT
     { vfp_single_fuito,  OP_SCALAR },         //0x00000010 - FEXT_FUITO
     { vfp_single_fsito,  OP_SCALAR },         //0x00000011 - FEXT_FSITO
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
-    { NULL, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
+    { nullptr, 0 },
     { vfp_single_ftoui,  OP_SCALAR },         //0x00000018 - FEXT_FTOUI
     { vfp_single_ftouiz, OP_SCALAR },         //0x00000019 - FEXT_FTOUIZ
     { vfp_single_ftosi,  OP_SCALAR },         //0x0000001A - FEXT_FTOSI
diff --git a/src/core/hle/service/soc_u.cpp b/src/core/hle/service/soc_u.cpp
index d768a3fc76..633b66fe21 100644
--- a/src/core/hle/service/soc_u.cpp
+++ b/src/core/hle/service/soc_u.cpp
@@ -485,7 +485,7 @@ static void GetHostId(Service::Interface* self) {
     addrinfo* res;
 
     hints.ai_family = AF_INET;
-    getaddrinfo(name, NULL, &hints, &res);
+    getaddrinfo(name, nullptr, &hints, &res);
     sockaddr_in* sock_addr = reinterpret_cast<sockaddr_in*>(res->ai_addr);
     in_addr* addr = &sock_addr->sin_addr;