diff --git a/splash/Splash.cc b/splash/Splash.cc
index 3d80c4c..cd0ec72 100644
--- a/splash/Splash.cc
+++ b/splash/Splash.cc
@@ -3927,6 +3927,8 @@
       xa = imgCoordMungeLower(section[i].xa0 +
 			      ((SplashCoord)y + 0.5 - section[i].ya0) *
 			        section[i].dxdya);
+      if (unlikely(xa < 0))
+        xa = 0;
       xb = imgCoordMungeUpper(section[i].xb0 +
 			      ((SplashCoord)y + 0.5 - section[i].yb0) *
 			        section[i].dxdyb);