diff --git a/add-patch.c b/add-patch.c
index 2252895c28..814de57c4a 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -1227,6 +1227,7 @@ static int prompt_yesno(struct add_p_state *s, const char *prompt)
 		fflush(stdout);
 		if (read_single_character(s) == EOF)
 			return -1;
+		/* do not limit to 1-byte input to allow 'no' etc. */
 		switch (tolower(s->answer.buf[0])) {
 		case 'n': return 0;
 		case 'y': return 1;
@@ -1510,6 +1511,12 @@ static int patch_update_file(struct add_p_state *s,
 		if (!s->answer.len)
 			continue;
 		ch = tolower(s->answer.buf[0]);
+
+		/* 'g' takes a hunk number and '/' takes a regexp */
+		if (s->answer.len != 1 && (ch != 'g' && ch != '/')) {
+			err(s, _("Only one letter is expected, got '%s'"), s->answer.buf);
+			continue;
+		}
 		if (ch == 'y') {
 			hunk->use = USE_HUNK;
 soft_increment:
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 28a95a775d..6624a4f7c0 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -160,6 +160,14 @@ test_expect_success 'revert works (commit)' '
 	grep "unchanged *+3/-0 file" output
 '
 
+test_expect_success 'reject multi-key input' '
+	saved=$(git hash-object -w file) &&
+	test_when_finished "git cat-file blob $saved >file" &&
+	echo an extra line >>file &&
+	test_write_lines aa | git add -p >actual &&
+	test_grep "is expected, got ${SQ}aa${SQ}" actual
+'
+
 test_expect_success 'setup expected' '
 	cat >expected <<-\EOF
 	EOF
@@ -526,7 +534,7 @@ test_expect_success 'split hunk setup' '
 	test_write_lines 10 15 20 21 22 23 24 30 40 50 60 >test
 '
 
-test_expect_success 'goto hunk' '
+test_expect_success 'goto hunk 1 with "g 1"' '
 	test_when_finished "git reset" &&
 	tr _ " " >expect <<-EOF &&
 	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]? + 1:  -1,2 +1,3          +15
@@ -542,7 +550,20 @@ test_expect_success 'goto hunk' '
 	test_cmp expect actual.trimmed
 '
 
-test_expect_success 'navigate to hunk via regex' '
+test_expect_success 'goto hunk 1 with "g1"' '
+	test_when_finished "git reset" &&
+	tr _ " " >expect <<-EOF &&
+	_10
+	+15
+	_20
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]?_
+	EOF
+	test_write_lines s y g1 | git add -p >actual &&
+	tail -n 4 <actual >actual.trimmed &&
+	test_cmp expect actual.trimmed
+'
+
+test_expect_success 'navigate to hunk via regex /pattern' '
 	test_when_finished "git reset" &&
 	tr _ " " >expect <<-EOF &&
 	(2/2) Stage this hunk [y,n,q,a,d,K,g,/,e,p,?]? @@ -1,2 +1,3 @@
@@ -556,6 +577,19 @@ test_expect_success 'navigate to hunk via regex' '
 	test_cmp expect actual.trimmed
 '
 
+test_expect_success 'navigate to hunk via regex / pattern' '
+	test_when_finished "git reset" &&
+	tr _ " " >expect <<-EOF &&
+	_10
+	+15
+	_20
+	(1/2) Stage this hunk [y,n,q,a,d,j,J,g,/,e,p,?]?_
+	EOF
+	test_write_lines s y / 1,2 | git add -p >actual &&
+	tail -n 4 <actual >actual.trimmed &&
+	test_cmp expect actual.trimmed
+'
+
 test_expect_success 'split hunk "add -p (edit)"' '
 	# Split, say Edit and do nothing.  Then:
 	#