diff --git a/modules/rostests/tests/polytest/polytest.cpp b/modules/rostests/tests/polytest/polytest.cpp
index 53567c6a6d2..a89f22beb1b 100644
--- a/modules/rostests/tests/polytest/polytest.cpp
+++ b/modules/rostests/tests/polytest/polytest.cpp
@@ -612,7 +612,7 @@ POLYGONFILL_FillScanLineWinding(
       if ( (newx1 >= x1 && newx1 <= x2)
 	|| (newx2 >= x1 && newx2 <= x2)
 	|| (x1 >= newx1 && x1 <= newx2)
-	|| (x2 >= newx2 && x2 <= newx2)
+	|| (x2 >= newx1 && x2 <= newx2)
 	)
       {
 	// yup, just tack it on to our existing line
diff --git a/win32ss/gdi/ntgdi/polyfill.c b/win32ss/gdi/ntgdi/polyfill.c
index d6bd2bdb73d..ab7af9603f2 100644
--- a/win32ss/gdi/ntgdi/polyfill.c
+++ b/win32ss/gdi/ntgdi/polyfill.c
@@ -475,7 +475,7 @@ POLYGONFILL_FillScanLineWinding(
             if ((newx1 >= x1 && newx1 <= x2) ||
                 (newx2 >= x1 && newx2 <= x2) ||
                 (x1 >= newx1 && x1 <= newx2) ||
-                (x2 >= newx2 && x2 <= newx2))
+                (x2 >= newx1 && x2 <= newx2))
             {
                 // Yup, just tack it on to our existing line
                 x1 = min(x1,newx1);