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-rw-r--r--editor/pnmcat.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/editor/pnmcat.c b/editor/pnmcat.c
index a26dcf3e..217f6b57 100644
--- a/editor/pnmcat.c
+++ b/editor/pnmcat.c
@@ -367,7 +367,8 @@ getPbmImageInfo(struct imgInfo        const img[],
             switch (backcolor) {
             case BACK_AUTO: {
                 bit bgBit;
-                img2[i].proberow = pbm_allocrow_packed(img[i].cols+7);
+                img2[i].proberow =
+                    pbm_allocrow_packed((unsigned int)img[i].cols + 7);
                 pbm_readpbmrow_bitoffset(
                     img[i].ifP, img2[i].proberow,
                     img[i].cols, img[i].format, img2[i].offset % 8);