diff --git a/common/xash3d_types.h b/common/xash3d_types.h
index 33801433..4c2c05d5 100644
--- a/common/xash3d_types.h
+++ b/common/xash3d_types.h
@@ -57,6 +57,7 @@ typedef uint64_t longtime_t;
 #define MAX_USERMSG_LENGTH	2048	// don't modify it's relies on a client-side definitions
 
 #define BIT( n )		( 1U << ( n ))
+#define BIT64( n )		( 1ULL << ( n ))
 #define GAMMA		( 2.2f )		// Valve Software gamma
 #define INVGAMMA		( 1.0f / 2.2f )	// back to 1.0
 #define TEXGAMMA		( 0.9f )		// compensate dim textures
diff --git a/ref/gl/gl2_shim/gl2_shim.c b/ref/gl/gl2_shim/gl2_shim.c
index 904f0d8e..63b2c9e1 100644
--- a/ref/gl/gl2_shim/gl2_shim.c
+++ b/ref/gl/gl2_shim/gl2_shim.c
@@ -1309,9 +1309,9 @@ static void GL2_Mul4x4( const GLfloat *in0, const GLfloat *in1, GLfloat *out )
 static void GL2_UpdateMVP( gl2wrap_prog_t *prog )
 {
 	// use bitset to determine if need update matrix for this prog
-	if( FBitSet( gl2wrap_matrix.update, BIT( prog->flags )))
+	if( FBitSet( gl2wrap_matrix.update, BIT64( prog->flags )))
 	{
-		ClearBits( gl2wrap_matrix.update, BIT( prog->flags ));
+		ClearBits( gl2wrap_matrix.update, BIT64( prog->flags ));
 		GL2_Mul4x4( gl2wrap_matrix.mv, gl2wrap_matrix.pr, gl2wrap_matrix.mvp );
 		pglUniformMatrix4fvARB( prog->uMVP, 1, false, (void *)gl2wrap_matrix.mvp );
 	}