diff --git a/winsup/testsuite/winsup.api/ltp/fcntl07B.c b/winsup/testsuite/winsup.api/ltp/fcntl07B.c
index 4e94ff267..db866fddd 100644
--- a/winsup/testsuite/winsup.api/ltp/fcntl07B.c
+++ b/winsup/testsuite/winsup.api/ltp/fcntl07B.c
@@ -170,7 +170,7 @@ const char *File1 = DEFAULT_FILE;
 
 #define DEFAULT_SUBPROG "test_open"
 const char *openck = DEFAULT_SUBPROG;	/* support program name to check for open FD */
-const char subprog_path[_POSIX_PATH_MAX];/* path to exec "openck" with */
+char subprog_path[_POSIX_PATH_MAX];/* path to exec "openck" with */
 #define STRSIZE 255
 #define FIFONAME "FiFo"