diff --git a/c-programming/experiments/clock-malfunction-imitation.c b/c-programming/experiments/clock-malfunction-imitation.c
index ee6ec50..59353a5 100644
--- a/c-programming/experiments/clock-malfunction-imitation.c
+++ b/c-programming/experiments/clock-malfunction-imitation.c
@@ -16,20 +16,20 @@
 #define SECOND_PRECISION 1L
 #define TIME_BEFORE_ACCIDENT 2UL
 
-#define TEST_LABEL(s) { \
-	printf("Test: %s\n", s); \
-	fflush(stdout); \
-}
+#define TEST_LABEL(s) do {                                                    \
+    printf("Test: %s\n", s);                                                  \
+    fflush(stdout);                                                           \
+} while (0)
 
 #define CLOCK_FUN_BEGIN                                                       \
-	static unsigned ticks_before_accident = TIME_BEFORE_ACCIDENT;             \
-	time_t y;
+    static unsigned ticks_before_accident = TIME_BEFORE_ACCIDENT;             \
+    time_t y;
 
 #define CLOCK_FUN_END                                                         \
-	if (x != NULL) {                                                          \
-		*x = y;                                                               \
-	}                                                                         \
-	return y;
+    if (x != NULL)                                                            \
+        *x = y;                                                               \
+                                                                              \
+    return y;
 
 time_t clock_change_time(time_t* x);
 time_t clock_exponential_growth(time_t* x);