diff --git a/unicode.cpp b/unicode.cpp
index 2477d4ae17..73db0e1ce4 100644
--- a/unicode.cpp
+++ b/unicode.cpp
@@ -10,6 +10,8 @@
 #include <unordered_map>
 #include <utility>
 #include <vector>
+#include <locale>
+#include <codecvt>
 
 static std::string unicode_cpts_to_utf8(const std::vector<uint32_t> & cps) {
     std::string result;
diff --git a/unicode.h b/unicode.h
index 4481358b63..efe04ce99c 100644
--- a/unicode.h
+++ b/unicode.h
@@ -3,8 +3,6 @@
 #include <cstdint>
 #include <string>
 #include <vector>
-#include <locale>
-#include <codecvt>
 
 #define CODEPOINT_TYPE_UNIDENTIFIED 0
 #define CODEPOINT_TYPE_DIGIT        1