1 files changed, 1 insertions, 1 deletions
diff --git a/math.c b/math.c
index 1d7d5e4188..027932dee9 100644
--- a/math.c
+++ b/math.c
@@ -710,7 +710,7 @@ static VALUE
 math_lgamma(VALUE obj, VALUE x)
 {
     double d0, d;
-    int sign;
+    int sign=1;
     VALUE v;
     Need_Float(x);
     errno = 0;