diff --git a/tests/arm/fuzz_arm.cpp b/tests/arm/fuzz_arm.cpp
index 5dbf3a95..db105aa2 100644
--- a/tests/arm/fuzz_arm.cpp
+++ b/tests/arm/fuzz_arm.cpp
@@ -288,9 +288,9 @@ void FuzzJitArm(const size_t instruction_count, const size_t instructions_to_exe
                 printf("%zu [%x] = %" PRIx64 "\n", record.size, record.address, record.data);
             }
 
-            u32 num_insts = 0;
+            size_t num_insts = 0;
             while (num_insts < instructions_to_execute_count) {
-                Dynarmic::Arm::LocationDescriptor descriptor = {num_insts * 4, false, false, 0};
+                Dynarmic::Arm::LocationDescriptor descriptor = {u32(num_insts * 4), false, false, 0};
                 Dynarmic::IR::Block ir_block = Dynarmic::Arm::Translate(descriptor, &MemoryRead32);
                 Dynarmic::Optimization::GetSetElimination(ir_block);
                 Dynarmic::Optimization::DeadCodeElimination(ir_block);