diff --git a/src/test/test-sizeof.c b/src/test/test-sizeof.c
index b9d63d6b41..6dee2022e8 100644
--- a/src/test/test-sizeof.c
+++ b/src/test/test-sizeof.c
@@ -16,6 +16,11 @@
 
 DISABLE_WARNING_TYPE_LIMITS;
 
+#define info_no_sign(t)                                                 \
+        printf("%s → %zu bits, %zu byte alignment\n", STRINGIFY(t),     \
+               sizeof(t)*CHAR_BIT,                                      \
+               __alignof__(t))
+
 #define info(t)                                                         \
         printf("%s → %zu bits%s, %zu byte alignment\n", STRINGIFY(t),   \
                sizeof(t)*CHAR_BIT,                                      \
@@ -37,6 +42,12 @@ enum BigEnum2 {
 };
 
 int main(void) {
+        int (*function_pointer)(void);
+
+        info_no_sign(function_pointer);
+        info_no_sign(void*);
+        info(char*);
+
         info(char);
         info(signed char);
         info(unsigned char);