diff --git a/vrclient_x64/vrclient.spec b/vrclient_x64/vrclient.spec
index db5cdd6bc5..051038ecf6 100644
--- a/vrclient_x64/vrclient.spec
+++ b/vrclient_x64/vrclient.spec
@@ -1,6 +1,6 @@
 # Generated from vrclient.dll by winedump
 
-1 stdcall HmdSystemFactory(ptr ptr)
-2 stdcall VRClientCoreFactory(ptr ptr)
+1 cdecl HmdSystemFactory(ptr ptr)
+2 cdecl VRClientCoreFactory(ptr ptr)
 
 @ cdecl -private vrclient_init_registry()
diff --git a/vrclient_x64/vrclient_main.c b/vrclient_x64/vrclient_main.c
index 9dec1c6431..f946053c8a 100644
--- a/vrclient_x64/vrclient_main.c
+++ b/vrclient_x64/vrclient_main.c
@@ -180,7 +180,7 @@ static int load_vrclient(void)
     return vrclient_loaded;
 }
 
-void * __stdcall HmdSystemFactory(const char *name, int *return_code)
+void *CDECL HmdSystemFactory(const char *name, int *return_code)
 {
     struct vrclient_HmdSystemFactory_params params = {.name = name, .return_code = return_code};
     TRACE("name: %s, return_code: %p\n", name, return_code);
@@ -189,7 +189,7 @@ void * __stdcall HmdSystemFactory(const char *name, int *return_code)
     return create_win_interface( name, params._ret );
 }
 
-void * __stdcall VRClientCoreFactory(const char *name, int *return_code)
+void *CDECL VRClientCoreFactory(const char *name, int *return_code)
 {
     struct vrclient_VRClientCoreFactory_params params = {.name = name, .return_code = return_code};
     TRACE("name: %s, return_code: %p\n", name, return_code);