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-rw-r--r--math.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/math.c b/math.c
index 37d019bc70..6bf233acee 100644
--- a/math.c
+++ b/math.c
@@ -35,7 +35,7 @@ to_flo(VALUE x)
} while (0)
static void
-domain_check(double x, char *msg)
+domain_check(double x, const char *msg)
{
while(1) {
if (errno) {