diff --git a/dlls/msvcp100/tests/misc.c b/dlls/msvcp100/tests/misc.c
index 474095175b2..e85bf10ba81 100644
--- a/dlls/msvcp100/tests/misc.c
+++ b/dlls/msvcp100/tests/misc.c
@@ -83,7 +83,7 @@ static void init_thiscall_thunk(void)
 }
 
 #define call_func1(func,_this) call_thiscall_func1(func,_this)
-#define call_func2(func,_this,a) call_thiscall_func2(func,_this,(const void*)a)
+#define call_func2(func,_this,a) call_thiscall_func2(func,_this,(const void*)(a))
 
 #else
 
diff --git a/dlls/msvcp100/tests/string.c b/dlls/msvcp100/tests/string.c
index eb02bc557ee..c9631697c9f 100644
--- a/dlls/msvcp100/tests/string.c
+++ b/dlls/msvcp100/tests/string.c
@@ -67,7 +67,7 @@ static void init_thiscall_thunk(void)
 }
 
 #define call_func1(func,_this) call_thiscall_func1(func,_this)
-#define call_func2(func,_this,a) call_thiscall_func2(func,_this,(const void*)a)
+#define call_func2(func,_this,a) call_thiscall_func2(func,_this,(const void*)(a))
 
 #else