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diff --git a/test/asan/TestCases/strcspn-1.c b/test/asan/TestCases/strcspn-1.c
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+// Test string s1 overflow in strcspn function
+// RUN: %clang_asan %s -o %t && env ASAN_OPTIONS=$ASAN_OPTIONS:strict_string_checks=true not %run %t 2>&1 | FileCheck %s
+
+// Test intercept_strspn asan option
+// RUN: env ASAN_OPTIONS=$ASAN_OPTIONS:intercept_strspn=false %run %t 2>&1
+
+#include <assert.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+ size_t r;
+ char s2[] = "ab";
+ char s1[] = {'c', 'a'};
+ char s3 = 0;
+ r = strcspn(s1, s2);
+ // CHECK:'s{{[1|3]}}' <== Memory access at offset {{[0-9]+ .*}}flows this variable
+ assert(r == 1);
+ return 0;
+}