diff --git a/include/FastSIMD/ToolSet/Generic/Register.h b/include/FastSIMD/ToolSet/Generic/Register.h
index c81033a..df3d777 100644
--- a/include/FastSIMD/ToolSet/Generic/Register.h
+++ b/include/FastSIMD/ToolSet/Generic/Register.h
@@ -5,6 +5,7 @@
 #include <utility>
 #include <tuple>
 
+#include <FastSIMD/Utility/ArchDetect.h>
 #include <FastSIMD/Utility/FeatureEnums.h>
 
 #ifdef _MSC_VER
@@ -15,7 +16,9 @@
 #define FS_NEVERINLINE __attribute__( ( noinline ) )
 #endif
 
-#ifdef __clang__
+#if FASTSIMD_CURRENT_ARCH_IS( WASM )
+#define FS_VECTORCALL
+#elif defined( __clang__ )
 #define FS_VECTORCALL __regcall
 #elif defined( _MSC_VER )
 #define FS_VECTORCALL __vectorcall
diff --git a/include/FastSIMD/Utility/ArchDetect.h b/include/FastSIMD/Utility/ArchDetect.h
index f95eebe..ec3dd06 100644
--- a/include/FastSIMD/Utility/ArchDetect.h
+++ b/include/FastSIMD/Utility/ArchDetect.h
@@ -1,3 +1,4 @@
+#pragma once
 //Based on the Qt processor detection code, so should be very accurate
 //https: code.qt.io/cgit/qt/qtbase.git/tree/src/corelib/global/qprocessordetection.h