diff --git a/src/os_mac_conv.c b/src/os_mac_conv.c
index 3daf74a..fd62124 100644
--- a/src/os_mac_conv.c
+++ b/src/os_mac_conv.c
@@ -580,6 +580,10 @@
 #   ifdef HAVE_LOCALE_H
 	    setlocale(LC_ALL, "");
 #   endif
+#   if defined(FEAT_FLOAT) && defined(LC_NUMERIC)
+	    // Make sure strtod() uses a decimal point, not a comma.
+	    setlocale(LC_NUMERIC, "C");
+#   endif
 	}
     }
 }