diff --git a/code/renderergl2/tr_fbo.c b/code/renderergl2/tr_fbo.c
index b0a9478f9c..223cbe7f7d 100644
--- a/code/renderergl2/tr_fbo.c
+++ b/code/renderergl2/tr_fbo.c
@@ -648,10 +648,30 @@ void FBO_FastBlit(FBO_t *src, ivec4_t srcBox, FBO_t *dst, ivec4_t dstBox, int bu
 		int width  = dst ? dst->width  : glConfig.vidWidth;
 		int height = dst ? dst->height : glConfig.vidHeight;
 
+		qglScissor(0, 0, width, height);
+
 		VectorSet4(dstBoxFinal, 0, 0, width, height);
 	}
 	else
 	{
+		ivec4_t scissorBox;
+
+		Vector4Copy(dstBox, scissorBox);
+
+		if (scissorBox[2] < 0)
+		{
+			scissorBox[0] += scissorBox[2];
+			scissorBox[2] = fabsf(scissorBox[2]);
+		}
+
+		if (scissorBox[3] < 0)
+		{
+			scissorBox[1] += scissorBox[3];
+			scissorBox[3] = fabsf(scissorBox[3]);
+		}
+
+		qglScissor(scissorBox[0], scissorBox[1], scissorBox[2], scissorBox[3]);
+
 		VectorSet4(dstBoxFinal, dstBox[0], dstBox[1], dstBox[0] + dstBox[2], dstBox[1] + dstBox[3]);
 	}