diff --git a/ext/gd/gd.c b/ext/gd/gd.c
index 7b2c03672e9..a865b739054 100644
--- a/ext/gd/gd.c
+++ b/ext/gd/gd.c
@@ -1578,7 +1578,7 @@ PHP_FUNCTION(imagecolorat)
 	ZEND_FETCH_RESOURCE(im, gdImagePtr, IM, -1, "Image", le_gd);
 
 #if HAVE_LIBGD20
-	if(im->truecolor) {
+	if(im->trueColor) {
 		php_error(E_WARNING, "ImageColorAt does not work on TrueColor images");
 		RETURN_FALSE;
 	}