diff --git a/code/renderergl1/tr_init.c b/code/renderergl1/tr_init.c
index 58b330e1..ad46f806 100644
--- a/code/renderergl1/tr_init.c
+++ b/code/renderergl1/tr_init.c
@@ -872,6 +872,16 @@ void GL_SetDefaultState( void )
 	qglEnable( GL_SCISSOR_TEST );
 	qglDisable( GL_CULL_FACE );
 	qglDisable( GL_BLEND );
+
+	qglColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
+	qglClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
+	qglClearDepth( 1.0 );
+
+	qglDrawBuffer( GL_FRONT );
+	qglClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_ACCUM_BUFFER_BIT|GL_STENCIL_BUFFER_BIT );
+
+	qglDrawBuffer( GL_BACK );
+	qglClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_ACCUM_BUFFER_BIT|GL_STENCIL_BUFFER_BIT );
 }
 
 /*
diff --git a/code/renderergl2/tr_init.c b/code/renderergl2/tr_init.c
index df7ffed6..418c8a91 100644
--- a/code/renderergl2/tr_init.c
+++ b/code/renderergl2/tr_init.c
@@ -944,6 +944,16 @@ void GL_SetDefaultState( void )
 	qglEnable( GL_SCISSOR_TEST );
 	qglDisable( GL_CULL_FACE );
 	qglDisable( GL_BLEND );
+
+	qglColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
+	qglClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
+	qglClearDepth( 1.0 );
+
+	qglDrawBuffer( GL_FRONT );
+	qglClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_ACCUM_BUFFER_BIT|GL_STENCIL_BUFFER_BIT );
+
+	qglDrawBuffer( GL_BACK );
+	qglClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_ACCUM_BUFFER_BIT|GL_STENCIL_BUFFER_BIT );
 }
 
 /*