diff --git a/src/asmjit/base/cpuinfo.h b/src/asmjit/base/cpuinfo.h
index 6facdec..04abb62 100644
--- a/src/asmjit/base/cpuinfo.h
+++ b/src/asmjit/base/cpuinfo.h
@@ -59,7 +59,7 @@ struct CpuInfo {
   // [Construction / Destruction]
   // --------------------------------------------------------------------------
 
-  ASMJIT_INLINE CpuInfo(uint32_t size = sizeof(CpuInfo)) : _size(size) {}
+  ASMJIT_INLINE CpuInfo(uint32_t size) : _size(size) {}
 
   // --------------------------------------------------------------------------
   // [Accessors]
diff --git a/src/asmjit/x86/x86cpuinfo.h b/src/asmjit/x86/x86cpuinfo.h
index 91d8cc0..96e1962 100644
--- a/src/asmjit/x86/x86cpuinfo.h
+++ b/src/asmjit/x86/x86cpuinfo.h
@@ -200,8 +200,7 @@ struct X86CpuInfo : public CpuInfo {
   // [Construction / Destruction]
   // --------------------------------------------------------------------------
 
-  ASMJIT_INLINE X86CpuInfo(uint32_t size = sizeof(X86CpuInfo)) :
-    CpuInfo(size) {}
+  ASMJIT_INLINE X86CpuInfo();
 
   // --------------------------------------------------------------------------
   // [Accessors]
@@ -252,6 +251,9 @@ struct X86CpuInfo : public CpuInfo {
   uint32_t _maxLogicalProcessors;
 };
 
+ASMJIT_INLINE X86CpuInfo::X86CpuInfo() :
+  CpuInfo(sizeof(X86CpuInfo)) {}
+
 //! \}
 
 } // asmjit namespace