diff --git a/grep.c b/grep.c
index 6d60e2e557..5bc0f4f32a 100644
--- a/grep.c
+++ b/grep.c
@@ -615,6 +615,16 @@ static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
 		die(_("given pattern contains NULL byte (via -f <file>). This is only supported with -P under PCRE v2"));
 
 	p->is_fixed = is_fixed(p->pattern, p->patternlen);
+#ifdef USE_LIBPCRE2
+       if (!p->fixed && !p->is_fixed) {
+	       const char *no_jit = "(*NO_JIT)";
+	       const int no_jit_len = strlen(no_jit);
+	       if (starts_with(p->pattern, no_jit) &&
+		   is_fixed(p->pattern + no_jit_len,
+			    p->patternlen - no_jit_len))
+		       p->is_fixed = 1;
+       }
+#endif
 	if (p->fixed || p->is_fixed) {
 #ifdef USE_LIBPCRE2
 		opt->pcre2 = 1;
diff --git a/t/t7812-grep-icase-non-ascii.sh b/t/t7812-grep-icase-non-ascii.sh
index 0c685d3598..96c3572056 100755
--- a/t/t7812-grep-icase-non-ascii.sh
+++ b/t/t7812-grep-icase-non-ascii.sh
@@ -53,4 +53,32 @@ test_expect_success REGEX_LOCALE 'pickaxe -i on non-ascii' '
 	test_cmp expected actual
 '
 
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: setup invalid UTF-8 data' '
+	printf "\\200\\n" >invalid-0x80 &&
+	echo "ævar" >expected &&
+	cat expected >>invalid-0x80 &&
+	git add invalid-0x80
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep ASCII from invalid UTF-8 data' '
+	git grep -h "var" invalid-0x80 >actual &&
+	test_cmp expected actual &&
+	git grep -h "(*NO_JIT)var" invalid-0x80 >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data' '
+	test_might_fail git grep -h "æ" invalid-0x80 >actual &&
+	test_cmp expected actual &&
+	test_must_fail git grep -h "(*NO_JIT)æ" invalid-0x80 &&
+	test_cmp expected actual
+'
+
+test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data with -i' '
+	test_might_fail git grep -hi "Æ" invalid-0x80 >actual &&
+	test_cmp expected actual &&
+	test_must_fail git grep -hi "(*NO_JIT)Æ" invalid-0x80 &&
+	test_cmp expected actual
+'
+
 test_done