diff --git a/SLS_C/include/sls/string.h b/SLS_C/include/sls/string.h
index 70fbaa6..862480c 100644
--- a/SLS_C/include/sls/string.h
+++ b/SLS_C/include/sls/string.h
@@ -18,8 +18,10 @@ typedef struct {
     Boolean allocated;
 } SlsStr;
 
-#define SLS_STR(s) (SlsStr){ sizeof(s) - 1, (s), FALSE }
-#define SLS_STR_NULL (SlsStr){0, NULL, FALSE}
+#define SLS_STR_CONST(s) {sizeof(s) - 1, (s), FALSE}
+#define SLS_STR_NULL_CONST {0, NULL, FALSE}
+#define SLS_STR(s) (SlsStr) SLS_STR_CONST(s)
+#define SLS_STR_NULL (SlsStr) SLS_STR_NULL_CONST
 
 int sls_isascii(unsigned char c);
 size_t sls_str_nlen(const char *s, size_t maxlen);
diff --git a/SLS_C/tests/tests.c b/SLS_C/tests/tests.c
index e0f5c92..218f349 100644
--- a/SLS_C/tests/tests.c
+++ b/SLS_C/tests/tests.c
@@ -12,7 +12,7 @@
 
 static const Boolean PRINT_SUCCESSFUL_TESTS = TRUE;
 
-const SlsStr TEST_FILE_NAME = SLS_STR("TEST_FILE.SLS");
+const SlsStr TEST_FILE_NAME = SLS_STR_CONST("TEST_FILE.SLS");
 
 typedef struct {
     uint16_t errored;