diff --git a/graphics/grDStyle.c b/graphics/grDStyle.c
index 57d8f7b6..d85c15e4 100644
--- a/graphics/grDStyle.c
+++ b/graphics/grDStyle.c
@@ -229,7 +229,7 @@ styleBuildDisplayStyle(line, version)
 					 */
 
 	/* Allow colors to be specified by index or by name */
-	if (sscanf(colorName, ((version > 6) ? "%i" : "%o"), &color) == 0)
+	if (sscanf(colorName, ((version > 6) ? "%i" : "%o"), &color) <= 0)
 	    color = GrNameToColor(colorName);
 
 	newstyle->style.mask = (mask & grBitPlaneMask);