1 files changed, 4 insertions, 1 deletions

diff --git a/src/editfns.c b/src/editfns.c
index 0e40fde9ca4..b961e602e4c 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -4083,7 +4083,10 @@ usage: (format STRING &rest OBJECTS)  */)
                   int exponent_bytes = 0;
                   int signedp = src0 == '-' || src0 == '+' || src0 == ' ';
                   int significand_bytes;
-                  if (zero_flag && '0' <= src[signedp] && src[signedp] <= '9')
+                  if (zero_flag
+                      && ((src[signedp] >= '0' && src[signedp] <= '9')
+                          || (src[signedp] >= 'a' && src[signedp] <= 'f')
+                          || (src[signedp] >= 'A' && src[signedp] <= 'F')))
                     {
                       leading_zeros += padding;
                       padding = 0;