diff --git a/src/backend/commands/collationcmds.c b/src/backend/commands/collationcmds.c
index 8fb51e8c3d..7fd7f0fdf8 100644
--- a/src/backend/commands/collationcmds.c
+++ b/src/backend/commands/collationcmds.c
@@ -444,7 +444,7 @@ get_icu_language_tag(const char *localename)
 	UErrorCode	status;
 
 	status = U_ZERO_ERROR;
-	uloc_toLanguageTag(localename, buf, sizeof(buf), TRUE, &status);
+	uloc_toLanguageTag(localename, buf, sizeof(buf), true, &status);
 	if (U_FAILURE(status))
 		ereport(ERROR,
 				(errmsg("could not convert locale name \"%s\" to language tag: %s",