diff --git a/Tests/SourceGroups/main.c b/Tests/SourceGroups/main.c
index 212e64baa..2c1002ed8 100644
--- a/Tests/SourceGroups/main.c
+++ b/Tests/SourceGroups/main.c
@@ -1,10 +1,10 @@
 #include <stdio.h>
 
-extern int foo(void);
-extern int bar(void);
-extern int foobar(void);
-extern int barbar(void);
-extern int baz(void);
+int foo();
+int bar();
+int foobar();
+int barbar();
+int baz();
 
 int main()
 {