diff --git a/test/testdata/testRunnerGenerator.c b/test/testdata/testRunnerGenerator.c
index 7a4d63b..62989a0 100644
--- a/test/testdata/testRunnerGenerator.c
+++ b/test/testdata/testRunnerGenerator.c
@@ -24,7 +24,7 @@
 
 /* Include Passthroughs for Linking Tests */
 void putcharSpy(int c) { (void)putchar(c);}
-void flushSpy(int c) {}
+void flushSpy(void) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/testdata/testRunnerGeneratorSmall.c b/test/testdata/testRunnerGeneratorSmall.c
index a8707fb..c8aaf74 100644
--- a/test/testdata/testRunnerGeneratorSmall.c
+++ b/test/testdata/testRunnerGeneratorSmall.c
@@ -16,7 +16,7 @@ TEST_FILE("some_file.c")
 
 /* Include Passthroughs for Linking Tests */
 void putcharSpy(int c) { (void)putchar(c);}
-void flushSpy(int c) {}
+void flushSpy(void) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/testdata/testRunnerGeneratorWithMocks.c b/test/testdata/testRunnerGeneratorWithMocks.c
index a7d622d..4aacbf9 100644
--- a/test/testdata/testRunnerGeneratorWithMocks.c
+++ b/test/testdata/testRunnerGeneratorWithMocks.c
@@ -25,7 +25,7 @@
 
 /* Include Passthroughs for Linking Tests */
 void putcharSpy(int c) { (void)putchar(c);}
-void flushSpy(int c) {}
+void flushSpy(void) {}
 
 /* Global Variables Used During These Tests */
 int CounterSetup = 0;
diff --git a/test/tests/testparameterized.c b/test/tests/testparameterized.c
index 7be7f2b..136cd2f 100644
--- a/test/tests/testparameterized.c
+++ b/test/tests/testparameterized.c
@@ -13,7 +13,7 @@
 
 /* Include Passthroughs for Linking Tests */
 void putcharSpy(int c) { (void)putchar(c);}
-void flushSpy(int c) {}
+void flushSpy(void) {}
 
 #define EXPECT_ABORT_BEGIN \
     if (TEST_PROTECT())    \