diff --git a/SLS_C/src/string.c b/SLS_C/src/string.c
index 2e2cffc..aba5760 100644
--- a/SLS_C/src/string.c
+++ b/SLS_C/src/string.c
@@ -309,7 +309,7 @@ SlsStr sls_format(const SlsStr s, ...) {
         target_i += items[item_i].self_length;
         item_i++;
     }
-    if (s.len > source_i)
+    if (s.len > (size_t)source_i)
         memcpy(str + target_i, s.str + source_i, s.len - source_i);
     str[str_new.len] = '\0';
 
diff --git a/SLS_C/tests/extra_tests.c b/SLS_C/tests/extra_tests.c
index 3a03405..8172ec7 100644
--- a/SLS_C/tests/extra_tests.c
+++ b/SLS_C/tests/extra_tests.c
@@ -24,6 +24,7 @@ TestsReport run_extra_tests()
         .tests = malloc(sizeof(TestResult) * NUM_EXTRA_TESTS)};
 
     size_t i = 0;
+    (void)i;
     // report.tests[i++] = test_malloc_and_copy();
     return report;
 }