diff --git a/src/ds/fmt.c b/src/ds/fmt.c
index 2d3ca4d..76e0790 100644
--- a/src/ds/fmt.c
+++ b/src/ds/fmt.c
@@ -576,5 +576,9 @@ void fmt_init() {
 }
 
 void fmt_term() {
+	if (!initialized) {
+		ERROR_ASSERT(ERROR_STRING("fmt: fmt_term() called while fmt uninitialized"));
+	}
+	initialized = false;
 	_print_func_map_term(_print_funcs);
 }