diff --git a/src/ifcparse/IfcParse.cpp b/src/ifcparse/IfcParse.cpp
index 86e88bb523..d00bda2049 100644
--- a/src/ifcparse/IfcParse.cpp
+++ b/src/ifcparse/IfcParse.cpp
@@ -53,6 +53,9 @@ void init_locale() {
 	}
 }
 #else
+#ifdef __APPLE__
+#include <xlocale.h>
+#endif
 static locale_t locale = (locale_t) 0;
 void init_locale() {
 	if (locale == (locale_t) 0) {