diff --git a/tests/generation/generation_noise.c b/tests/generation/generation_noise.c
index 1022be1b..e10ff850 100644
--- a/tests/generation/generation_noise.c
+++ b/tests/generation/generation_noise.c
@@ -35,7 +35,7 @@ ma_result test_noise__by_format_and_type(ma_format format, ma_noise_type type, c
     return MA_SUCCESS;
 }
 
-ma_result test_noise__f32()
+ma_result test_noise__f32(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;
@@ -62,7 +62,7 @@ ma_result test_noise__f32()
     }
 }
 
-ma_result test_noise__s16()
+ma_result test_noise__s16(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;
@@ -89,7 +89,7 @@ ma_result test_noise__s16()
     }
 }
 
-ma_result test_noise__u8()
+ma_result test_noise__u8(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;
diff --git a/tests/generation/generation_waveform.c b/tests/generation/generation_waveform.c
index 3268d241..d3c3c7f3 100644
--- a/tests/generation/generation_waveform.c
+++ b/tests/generation/generation_waveform.c
@@ -35,7 +35,7 @@ ma_result test_waveform__by_format_and_type(ma_format format, ma_waveform_type t
     return MA_SUCCESS;
 }
 
-ma_result test_waveform__f32()
+ma_result test_waveform__f32(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;
@@ -93,7 +93,7 @@ ma_result test_waveform__f32()
     }
 }
 
-ma_result test_waveform__s16()
+ma_result test_waveform__s16(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;
@@ -151,7 +151,7 @@ ma_result test_waveform__s16()
     }
 }
 
-ma_result test_waveform__u8()
+ma_result test_waveform__u8(void)
 {
     ma_result result;
     ma_bool32 hasError = MA_FALSE;