diff --git a/test/testshape.c b/test/testshape.c
index 2bf9c60d2..cad28c40b 100644
--- a/test/testshape.c
+++ b/test/testshape.c
@@ -85,7 +85,7 @@ int main(int argc,char** argv) {
 		format = pictures[i].surface->format;
 		if(format->Amask != 0) {
 			pictures[i].mode.mode = ShapeModeBinarizeAlpha;
-			pictures[i].mode.parameters.binarizationCutoff = 1;
+			pictures[i].mode.parameters.binarizationCutoff = 255;
 		}
 		else {
 			pictures[i].mode.mode = ShapeModeColorKey;