diff --git a/extra/openal/alut/macosx/macosx.factor b/extra/openal/alut/macosx/macosx.factor
index 3c0a4672cb..54439b762c 100755
--- a/extra/openal/alut/macosx/macosx.factor
+++ b/extra/openal/alut/macosx/macosx.factor
@@ -6,7 +6,7 @@ IN: openal.alut.macosx
 
 LIBRARY: alut
 
-FUNCTION: void alutLoadWAVFile ( ALbyte* fileName, ALenum* format, void** data, ALsizei* size, ALsizei* frequency ) ;
+FUNCTION: void alutLoadWAVFile ( c-string fileName, ALenum* format, void** data, ALsizei* size, ALsizei* frequency ) ;
 
 M: macosx load-wav-file ( path -- format data size frequency )
     0 <int> f <void*> 0 <int> 0 <int>
diff --git a/extra/openal/alut/other/other.factor b/extra/openal/alut/other/other.factor
index b19579286b..8b1cbd0cb3 100755
--- a/extra/openal/alut/other/other.factor
+++ b/extra/openal/alut/other/other.factor
@@ -6,7 +6,7 @@ IN: openal.alut.other
 
 LIBRARY: alut
 
-FUNCTION: void alutLoadWAVFile ( ALbyte* fileName, ALenum* format, void** data, ALsizei* size, ALsizei* frequency, ALboolean* looping ) ;
+FUNCTION: void alutLoadWAVFile ( c-string fileName, ALenum* format, void** data, ALsizei* size, ALsizei* frequency, ALboolean* looping ) ;
 
 M: object load-wav-file ( filename -- format data size frequency )
     0 <int> f <void*> 0 <int> 0 <int>