diff --git a/c-programming/mem/safe_mem.test.c b/c-programming/mem/safe_mem.test.c
index e8b0f9e..337ab38 100644
--- a/c-programming/mem/safe_mem.test.c
+++ b/c-programming/mem/safe_mem.test.c
@@ -18,10 +18,10 @@
 
 #define PRINT_POINTER(caption, ptr)                                           \
     printf(caption " = %p\n", (void*) ptr);
-#define DUMP_INT_ARRAY(caption, ptr, count) do {                              \
+#define DUMP_INT_ARRAY(caption, ptr, count, fmt) do {                         \
     printf("%s: [", caption);                                                 \
     for (size_t i = 0; i < count; i++) {                                      \
-        printf("%d", ptr[i]);                                                 \
+        printf(fmt, ptr[i]);                                                  \
         if (i != (count - 1))                                                 \
             printf(", ");                                                     \
     }                                                                         \
@@ -37,7 +37,8 @@ int main(void) {
 	integers[1] = EOF;
 	integers[2] = 2;
 	integers[3] = 1;
-	DUMP_INT_ARRAY("int* integers (before secure erasure)", integers, COUNT);
+	DUMP_INT_ARRAY("int* integers (before secure erasure)", integers, COUNT,
+	               "%d");
 	printf("Secure erasure is "
 #if NO_SECURE_ERASE_WARRANTY
 		"not guaranteed!"
@@ -51,7 +52,8 @@ int main(void) {
 		);
 
 	secure_erase(integers, COUNT * sizeof(int));
-	DUMP_INT_ARRAY("int* integers (after secure erasure)", integers, COUNT);
+	DUMP_INT_ARRAY("int* integers (after secure erasure)", integers, COUNT,
+	               "%d");
 
 	safe_free(integers);
 	PRINT_POINTER("int* integers (after freeing)", integers);