diff --git a/sc2/src/sc2code/libs/sound/decoders/dukaud.c b/sc2/src/sc2code/libs/sound/decoders/dukaud.c
index 8c501760c..5d4b604e5 100644
--- a/sc2/src/sc2code/libs/sound/decoders/dukaud.c
+++ b/sc2/src/sc2code/libs/sound/decoders/dukaud.c
@@ -36,7 +36,7 @@
 
 static const char* duka_GetName (void);
 static bool duka_InitModule (int flags, const TFB_DecoderFormats*);
-static void duka_TermModule ();
+static void duka_TermModule (void);
 static uint32 duka_GetStructSize (void);
 static int duka_GetError (THIS_PTR);
 static bool duka_Init (THIS_PTR);
@@ -349,7 +349,7 @@ duka_InitModule (int flags, const TFB_DecoderFormats* fmts)
 }
 
 static void
-duka_TermModule ()
+duka_TermModule (void)
 {
 	// no specific module term
 }
diff --git a/sc2/src/sc2code/libs/sound/decoders/modaud.c b/sc2/src/sc2code/libs/sound/decoders/modaud.c
index a4f9f6651..d200353ed 100644
--- a/sc2/src/sc2code/libs/sound/decoders/modaud.c
+++ b/sc2/src/sc2code/libs/sound/decoders/modaud.c
@@ -34,7 +34,7 @@
 
 static const char* moda_GetName (void);
 static bool moda_InitModule (int flags, const TFB_DecoderFormats*);
-static void moda_TermModule ();
+static void moda_TermModule (void);
 static uint32 moda_GetStructSize (void);
 static int moda_GetError (THIS_PTR);
 static bool moda_Init (THIS_PTR);
@@ -126,7 +126,7 @@ moda_InitModule (int flags, const TFB_DecoderFormats* fmts)
 }
 
 static void
-moda_TermModule ()
+moda_TermModule (void)
 {
 	MikMod_Exit ();
 }
diff --git a/sc2/src/sc2code/libs/sound/decoders/oggaud.c b/sc2/src/sc2code/libs/sound/decoders/oggaud.c
index 0d947ece8..4a4020019 100644
--- a/sc2/src/sc2code/libs/sound/decoders/oggaud.c
+++ b/sc2/src/sc2code/libs/sound/decoders/oggaud.c
@@ -34,7 +34,7 @@
 
 static const char* ova_GetName (void);
 static bool ova_InitModule (int flags, const TFB_DecoderFormats*);
-static void ova_TermModule ();
+static void ova_TermModule (void);
 static uint32 ova_GetStructSize (void);
 static int ova_GetError (THIS_PTR);
 static bool ova_Init (THIS_PTR);
@@ -123,7 +123,7 @@ ova_InitModule (int flags, const TFB_DecoderFormats* fmts)
 }
 
 static void
-ova_TermModule ()
+ova_TermModule (void)
 {
 	// no specific module term
 }