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-rw-r--r--other/pamarith.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/other/pamarith.c b/other/pamarith.c
index a4cb3502..301f76a0 100644
--- a/other/pamarith.c
+++ b/other/pamarith.c
@@ -374,7 +374,7 @@ computeOutputType(struct pam *       const outpamP,
             outpamP->maxval = maxMaxval(inpam, operandCt);
         break;
     case CATEGORY_BITSTRING:
-        if (maxvalsAreEqual(inpam, operandCt))
+        if (!maxvalsAreEqual(inpam, operandCt))
             pm_error("For a bit string operation, the maxvals of the "
                      "operand images must be the same.  Yours differ");