1 files changed, 7 insertions, 2 deletions
diff --git a/numeric.c b/numeric.c
index 29f733b83a..3d01a641de 100644
--- a/numeric.c
+++ b/numeric.c
@@ -954,15 +954,20 @@ rb_fix2str(x, base)
     VALUE x;
     int base;
 {
-    char fmt[4], buf[22];
+    char fmt[4], buf[22], *b = buf;
+    long val = FIX2LONG(x);
 
     fmt[0] = '%'; fmt[1] = 'l'; fmt[3] = '\0';
     if (base == 10) fmt[2] = 'd';
     else if (base == 16) fmt[2] = 'x';
     else if (base == 8) fmt[2] = 'o';
     else rb_raise(rb_eArgError, "illegal radix %d", base);
+    if (val < 0) {
+	val = -val;
+	*b++ = '-';
+    }
 
-    sprintf(buf, fmt, FIX2LONG(x));
+    sprintf(b, fmt, val);
     return rb_str_new2(buf);
 }