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-rw-r--r--src/bignum.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/bignum.c b/src/bignum.c
index 859896cdcf7..669df4d9ee3 100644
--- a/src/bignum.c
+++ b/src/bignum.c
@@ -465,5 +465,5 @@ int
check_int_nonnegative (Lisp_Object x)
{
CHECK_INTEGER (x);
- return Fnatnump (x) ? check_integer_range (x, 0, INT_MAX) : 0;
+ return NILP (Fnatnump (x)) ? 0 : check_integer_range (x, 0, INT_MAX);
}