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-rw-r--r--editor/pnmcat.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/editor/pnmcat.c b/editor/pnmcat.c
index 5ede0bbc..ea622a34 100644
--- a/editor/pnmcat.c
+++ b/editor/pnmcat.c
@@ -497,7 +497,7 @@ concatenateTopBottomPbm(FILE *             const ofP,
             startRow = 0;
             backChange = FALSE;
             padleft = 0;
-            outrow[newcols-1] = 0x00;
+            outrow[pbm_packed_bytes(newcols)-1] = 0x00;
         } else {
             /* Determine amount of padding and color */
             switch (justification) {