diff --git a/Tests/ExportImport/Export/testExe1.c b/Tests/ExportImport/Export/testExe1.c
index 8ac154fdfc..e00fac74f4 100644
--- a/Tests/ExportImport/Export/testExe1.c
+++ b/Tests/ExportImport/Export/testExe1.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 
-extern int testExe1lib();
+extern int testExe1lib(void);
 
 int main(int argc, const char* argv[])
 {
diff --git a/Tests/ExportImport/Export/testExe1lib.c b/Tests/ExportImport/Export/testExe1lib.c
index 60cd746818..7ad48a3921 100644
--- a/Tests/ExportImport/Export/testExe1lib.c
+++ b/Tests/ExportImport/Export/testExe1lib.c
@@ -1 +1 @@
-int testExe1lib() { return 0; }
+int testExe1lib(void) { return 0; }
diff --git a/Tests/ExportImport/Export/testLib1.c b/Tests/ExportImport/Export/testLib1.c
index 5491bf960f..35bb1e5db5 100644
--- a/Tests/ExportImport/Export/testLib1.c
+++ b/Tests/ExportImport/Export/testLib1.c
@@ -1 +1 @@
-int testLib1() { return 0; }
+int testLib1(void) { return 0; }
diff --git a/Tests/ExportImport/Export/testLib2.c b/Tests/ExportImport/Export/testLib2.c
index 5feb83daf6..aabc0d30f0 100644
--- a/Tests/ExportImport/Export/testLib2.c
+++ b/Tests/ExportImport/Export/testLib2.c
@@ -1,4 +1,4 @@
 
-extern int testLib1();
+extern int testLib1(void);
 
-int testLib2() { return testLib1(); }
+int testLib2(void) { return testLib1(); }