diff --git a/contrib/ChangeLog b/contrib/ChangeLog
index 16d0667694d..4e89b8d611b 100644
--- a/contrib/ChangeLog
+++ b/contrib/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-17  Hans-Peter Nilsson  <hp@axis.com>
+
+	* gcc_update <git revision>: Use git log "--pretty=tformat:%p:%t:%H",
+	not "--pretty=%p:%t:%H".
+
 2020-01-16  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* gcc-git-customization.sh: Avoid double expansion.
diff --git a/contrib/gcc_update b/contrib/gcc_update
index 5df3297f7f8..8c980b15ad3 100755
--- a/contrib/gcc_update
+++ b/contrib/gcc_update
@@ -330,7 +330,7 @@ case $vcs_type in
             exit 1
 	fi
 
-	revision=`$GCC_GIT log -n1 --pretty=%p:%t:%H`
+	revision=`$GCC_GIT log -n1 --pretty=tformat:%p:%t:%H`
 	branch=`$GCC_GIT name-rev --name-only HEAD || :`
 	;;