diff --git a/common/include/Utilities/General.h b/common/include/Utilities/General.h
index 97a270eb77..f2182e5fad 100644
--- a/common/include/Utilities/General.h
+++ b/common/include/Utilities/General.h
@@ -235,7 +235,7 @@ namespace HostSys
 
 	extern void MemProtect( void* baseaddr, size_t size, const PageProtectionMode& mode );
 
-	extern void Munmap( void* base, size_t size ) { Munmap( (uptr)base, size); }
+	extern void Munmap( void* base, size_t size );
 
 	template< uint size >
 	void MemProtectStatic( u8 (&arr)[size], const PageProtectionMode& mode )
diff --git a/common/src/Utilities/VirtualMemory.cpp b/common/src/Utilities/VirtualMemory.cpp
index 8c5ed75d7c..9861ccfb12 100644
--- a/common/src/Utilities/VirtualMemory.cpp
+++ b/common/src/Utilities/VirtualMemory.cpp
@@ -500,3 +500,11 @@ wxString PageProtectionMode::ToString() const
 
 	return modeStr;
 }
+
+// --------------------------------------------------------------------------------------
+//  Common HostSys implementation
+// --------------------------------------------------------------------------------------
+void HostSys::Munmap( void* base, size_t size )
+{
+	Munmap( (uptr)base, size);
+}