1 files changed, 1 insertions, 0 deletions
diff --git a/lib.c b/lib.c
index 2d90909..9f691b1 100644
--- a/lib.c
+++ b/lib.c
@@ -571,6 +571,7 @@ void declare_builtin_functions(void)
 	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strspn(const char *, const char *);\n");
 	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strcspn(const char *, const char *);\n");
 	add_pre_buffer("extern char * __builtin_strpbrk(const char *, const char *);\n");
+	add_pre_buffer("extern __SIZE_TYPE__ __builtin_strlen(const char *);\n");
 
 	/* And some random ones.. */
 	add_pre_buffer("extern void *__builtin_return_address(unsigned int);\n");