diff --git a/src/ranges.cpp b/src/ranges.cpp
index 46eca489..fd7c48e8 100644
--- a/src/ranges.cpp
+++ b/src/ranges.cpp
@@ -21,8 +21,8 @@
 
 // libsemigroups....
 
-#include <libsemigroups/paths.hpp>  // for Paths
-#include <libsemigroups/words.hpp>  // for ToWord, ToString, WordRange...
+#include <libsemigroups/paths.hpp>       // for Paths
+#include <libsemigroups/word-range.hpp>  // for ToWord, ToString, WordRange...
 
 // pybind11....
 #include <pybind11/pybind11.h>  // for make_iterator, module
diff --git a/src/words.cpp b/src/words.cpp
index 00e8ff47..ae3d2c65 100644
--- a/src/words.cpp
+++ b/src/words.cpp
@@ -26,9 +26,9 @@
 
 // libsemigroups....
 
-#include <libsemigroups/paths.hpp>  // for Path
-#include <libsemigroups/types.hpp>  // for word_type
-#include <libsemigroups/words.hpp>  // for number_of_words
+#include <libsemigroups/paths.hpp>       // for Path
+#include <libsemigroups/types.hpp>       // for word_type
+#include <libsemigroups/word-range.hpp>  // for number_of_words
 
 // pybind11....
 #include <pybind11/complex.h>