diff --git a/loguru.cpp b/loguru.cpp
index 23651ca..9032245 100644
--- a/loguru.cpp
+++ b/loguru.cpp
@@ -32,6 +32,7 @@
 
 #include <algorithm>
 #include <atomic>
+#include <cassert>
 #include <chrono>
 #include <cstdarg>
 #include <cstdio>