diff --git a/src/BaseException.cpp b/src/BaseException.cpp
index 31d868400..7d69b0e58 100644
--- a/src/BaseException.cpp
+++ b/src/BaseException.cpp
@@ -3,6 +3,7 @@
 #include <string>
 #include <sstream>
 #include <iostream>
+#include <mutex>
 #include <boost/filesystem/path.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <boost/log/trivial.hpp>
diff --git a/src/slic3r/GUI/fts_fuzzy_match.h b/src/slic3r/GUI/fts_fuzzy_match.h
index 379fd9c74..c20960e37 100644
--- a/src/slic3r/GUI/fts_fuzzy_match.h
+++ b/src/slic3r/GUI/fts_fuzzy_match.h
@@ -33,6 +33,7 @@
 
 #include <cstdint> // uint8_t
 #include <ctype.h> // ::tolower, ::toupper
+#include <cwctype> // ::towlower
 #include <cstring> // memcpy
 
 #include <cstdio>