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-rw-r--r--misc/efgcvt_r.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/misc/efgcvt_r.c b/misc/efgcvt_r.c
index 099b349414..2da5e55b0b 100644
--- a/misc/efgcvt_r.c
+++ b/misc/efgcvt_r.c
@@ -66,7 +66,7 @@ ecvt_r (value, ndigit, decpt, sign, buf, len)
      char *buf;
      size_t len;
 {
-  ndigit -= (int) floor (log10 (value));
+  ndigit -= (int) floor (log10 (value < 0.0 ? -value : value));
   if (ndigit < 0)
     ndigit = 0;
   return fcvt_r (value, ndigit, decpt, sign, buf, len);