diff --git a/src/common/linux/dump_symbols.cc b/src/common/linux/dump_symbols.cc
index 36cd6d85..aff0d792 100644
--- a/src/common/linux/dump_symbols.cc
+++ b/src/common/linux/dump_symbols.cc
@@ -759,7 +759,7 @@ bool DumpSymbols::WriteSymbolFile(const std::string &obj_file,
     return false;
   void *obj_base = mmap(NULL, st.st_size,
                         PROT_READ | PROT_WRITE, MAP_PRIVATE, obj_fd, 0);
-  if (!obj_base)
+  if (obj_base == MAP_FAILED)
     return false;
   MmapWrapper map_wrapper(obj_base, st.st_size);
   ElfW(Ehdr) *elf_header = reinterpret_cast<ElfW(Ehdr) *>(obj_base);
diff --git a/src/common/linux/file_id.cc b/src/common/linux/file_id.cc
index d69d45a9..1adf2a13 100644
--- a/src/common/linux/file_id.cc
+++ b/src/common/linux/file_id.cc
@@ -101,7 +101,7 @@ bool FileID::ElfFileIdentifier(unsigned char identifier[16]) {
   }
   void *base = mmap(NULL, st.st_size,
                     PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-  if (!base) {
+  if (base == MAP_FAILED) {
     close(fd);
     return false;
   }
diff --git a/src/common/solaris/dump_symbols.cc b/src/common/solaris/dump_symbols.cc
index df1c5b09..a0697ff9 100644
--- a/src/common/solaris/dump_symbols.cc
+++ b/src/common/solaris/dump_symbols.cc
@@ -650,7 +650,7 @@ bool DumpSymbols::WriteSymbolFile(const std::string &obj_file, int sym_fd) {
     return false;
   void *obj_base = mmap(NULL, st.st_size,
                         PROT_READ, MAP_PRIVATE, obj_fd, 0);
-  if (!obj_base)
+  if (obj_base == MAP_FAILED))
     return false;
   MmapWrapper map_wrapper(obj_base, st.st_size);
   GElf_Ehdr elf_header;
diff --git a/src/common/solaris/file_id.cc b/src/common/solaris/file_id.cc
index 92e7f71f..643a1462 100644
--- a/src/common/solaris/file_id.cc
+++ b/src/common/solaris/file_id.cc
@@ -151,7 +151,7 @@ bool FileID::ElfFileIdentifier(unsigned char identifier[16]) {
     return false;
 
   void *base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-  if (!base)
+  if (base == MAP_FAILED)
     return false;
 
   bool success = false;