diff --git a/engine/gl/gl_vidmacos.c b/engine/gl/gl_vidmacos.c
index 616994c9..8bbf4af2 100644
--- a/engine/gl/gl_vidmacos.c
+++ b/engine/gl/gl_vidmacos.c
@@ -122,15 +122,6 @@ void GL_DoSwap(void)
 {
 }
 
-void GLVID_ForceLockState(int i)
-{
-}
-
-int GLVID_ForceUnlockedAndReturnState(void)
-{
-	return 0;
-}
-
 void GLVID_SetPalette (unsigned char *palette)
 {
 	qbyte *pal;
diff --git a/engine/gl/gl_vidmorphos.c b/engine/gl/gl_vidmorphos.c
index c7c2aa52..10e87324 100644
--- a/engine/gl/gl_vidmorphos.c
+++ b/engine/gl/gl_vidmorphos.c
@@ -638,31 +638,6 @@ void GLVID_ShiftPalette (unsigned char *palette)
 	}
 }
 
-void GLD_BeginDirectRect (int x, int y, qbyte *pbitmap, int width, int height)
-{
-}
-
-void GLD_EndDirectRect (int x, int y, int width, int height)
-{
-}
-
-void GLVID_UnlockBuffer(void)
-{
-}
-
-void GLVID_LockBuffer(void)
-{
-}
-
-int GLVID_ForceUnlockedAndReturnState (void)
-{
-	return 0;
-}
-
-void GLVID_ForceLockState (int lk)
-{
-}
-
 void Sys_SendKeyEvents(void)
 {
 }
diff --git a/engine/gl/gl_vidnull.c b/engine/gl/gl_vidnull.c
index faa2364a..3b170bea 100644
--- a/engine/gl/gl_vidnull.c
+++ b/engine/gl/gl_vidnull.c
@@ -45,23 +45,6 @@ void GL_DoSwap(void)
 {
 }
 
-void GLVID_LockBuffer (void)
-{
-}
-
-void GLVID_UnlockBuffer (void)
-{
-}
-
-int GLVID_ForceUnlockedAndReturnState (void)
-{
-	return 0;
-}
-
-void GLVID_ForceLockState (int lk)
-{
-}
-
 void GLVID_SetCaption(char *text)
 {
 }