diff --git a/src/KIM/kim_init.cpp b/src/KIM/kim_init.cpp
index bd45b1d75a..0fb450800c 100644
--- a/src/KIM/kim_init.cpp
+++ b/src/KIM/kim_init.cpp
@@ -68,6 +68,7 @@
 #include "modify.h"
 #include "universe.h"
 #include "variable.h"
+#include "fmt/format.h"
 
 #include <cstring>