builtin/rev-parse.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 4da1f1da2..cfb0f1510 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -671,8 +671,9 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				filter &= ~(DO_FLAGS|DO_NOREV);
 				verify = 1;
 				abbrev = DEFAULT_ABBREV;
-				if (arg[7] == '=')
-					abbrev = strtoul(arg + 8, NULL, 10);
+				if (!arg[7])
+					continue;
+				abbrev = strtoul(arg + 8, NULL, 10);
 				if (abbrev < MINIMUM_ABBREV)
 					abbrev = MINIMUM_ABBREV;
 				else if (40 <= abbrev)