diff --git a/Tests/XCTest/StaticLibExample/StaticLibExample.c b/Tests/XCTest/StaticLibExample/StaticLibExample.c
index b198f80f3d..8d16eb5969 100644
--- a/Tests/XCTest/StaticLibExample/StaticLibExample.c
+++ b/Tests/XCTest/StaticLibExample/StaticLibExample.c
@@ -1,6 +1,6 @@
 #include "StaticLibExample.h"
 
-int FourtyFour()
+int FourtyFour(void)
 {
   return 44;
 }
diff --git a/Tests/XCTest/StaticLibExample/StaticLibExample.h b/Tests/XCTest/StaticLibExample/StaticLibExample.h
index 147a909aa9..88695b1c8a 100644
--- a/Tests/XCTest/StaticLibExample/StaticLibExample.h
+++ b/Tests/XCTest/StaticLibExample/StaticLibExample.h
@@ -1 +1 @@
-int FourtyFour();
+int FourtyFour(void);