diff --git a/src/libslic3r/ExtrusionRole.cpp b/src/libslic3r/ExtrusionRole.cpp
index 4d894b4acb..f43db4835d 100644
--- a/src/libslic3r/ExtrusionRole.cpp
+++ b/src/libslic3r/ExtrusionRole.cpp
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <string_view>
+#include <cassert>
 
 #define L(s) (s)