diff --git a/devmem2.c b/devmem2.c
index cc174ac..4ef7665 100644
--- a/devmem2.c
+++ b/devmem2.c
@@ -117,7 +117,7 @@ int main(int argc, char **argv) {
 			fprintf(stderr, "Illegal data type '%c'.\n", access_type);
 			exit(2);
 	}
-	sprintf(fmt_str, "Read at address  0x%%08lX (%%p): 0x%%0%dlX\n", 2*data_size);
+	sprintf(fmt_str, "Read at address  0x%%08lX (%%p): 0x%%0%zulX\n", 2*data_size);
     printf(fmt_str, (unsigned long)target, virt_addr, read_result);
     fflush(stdout);
 
@@ -145,8 +145,8 @@ int main(int argc, char **argv) {
 				read_result = *((uint64_t *) virt_addr);
 				break;
 		}
-		sprintf(fmt_str, "Write at address 0x%%08lX (%%p): 0x%%0%dlX, "
-			"readback 0x%%0%dlX\n",	2*data_size, 2*data_size);
+		sprintf(fmt_str, "Write at address 0x%%08lX (%%p): 0x%%0%zulX, "
+			"readback 0x%%0%zulX\n",	2*data_size, 2*data_size);
 		printf(fmt_str, (unsigned long)target, virt_addr,
 			write_val, read_result);
 		fflush(stdout);
@@ -163,6 +163,8 @@ static inline void *fixup_addr(void *addr, size_t size)
 	unsigned long aligned_addr = (unsigned long)addr;
 	aligned_addr &= ~(size - 1);
 	addr = (void *)aligned_addr;
+#else
+	(void)(size);
 #endif
 	return addr;
 }