diff --git a/common/include/villas/hist.hpp b/common/include/villas/hist.hpp
index 33fa4549c..afc80b7d8 100644
--- a/common/include/villas/hist.hpp
+++ b/common/include/villas/hist.hpp
@@ -40,7 +40,7 @@ public:
 	using cnt_t = uintmax_t;
 
 	/** Initialize struct hist with supplied values and allocate memory for buckets. */
-	Hist(int buckets, cnt_t warmup);
+	Hist(int buckets = 0, cnt_t warmup = 0);
 
 	/** Free the dynamically allocated memory. */
 	~Hist();
diff --git a/common/tests/unit/hist.cpp b/common/tests/unit/hist.cpp
index 41ec005ef..e011b6a8a 100644
--- a/common/tests/unit/hist.cpp
+++ b/common/tests/unit/hist.cpp
@@ -33,7 +33,7 @@ TestSuite(hist, .description = "Histogram");
 
 Test(hist, simple) {
 
-	Hist h(0, 0);
+	Hist h;
 
 	for (unsigned i = 0; i < ARRAY_LEN(test_data); i++)
 		h.put(test_data[i]);