diff --git a/include/spdlog/cfg/env-inl.h b/include/spdlog/cfg/env-inl.h
index 59c38cf3..cb61aa41 100644
--- a/include/spdlog/cfg/env-inl.h
+++ b/include/spdlog/cfg/env-inl.h
@@ -14,7 +14,6 @@
 #include <string>
 #include <utility>
 #include <sstream>
-#include <cassert>
 
 namespace spdlog {
 namespace env {