diff --git a/include/villas/utils.h b/include/villas/utils.h
index 0e29fba8e..e6ef0e469 100644
--- a/include/villas/utils.h
+++ b/include/villas/utils.h
@@ -221,7 +221,8 @@ __attribute__((always_inline)) static inline uint64_t rdtsc()
 
 /** Get log2 of long long integers */
 static inline int log2i(long long x) {
-	assert(x > 0);
+	if (x == 0)
+		return 1;
 
 	return sizeof(x) * 8 - __builtin_clzll(x) - 1;
 }