diff --git a/src/kernel/qimage.cpp b/src/kernel/qimage.cpp
index 8dd71be..4bb9947 100644
--- a/src/kernel/qimage.cpp
+++ b/src/kernel/qimage.cpp
@@ -5196,7 +5196,7 @@ static void read_pbm_image( QImageIO *iio )	// read PBM image data
 	mcc = 1;				// ignore max color component
     else
 	mcc = read_pbm_int( d );		// get max color component
-    if ( w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0 )
+    if ( w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0 || mcc > 0xffff )
 	return;					// weird P.M image
 
     int maxc = mcc;