diff --git a/src/thread/nt32/clone.c b/src/thread/nt32/clone.c
index 12d7e5e..9c5a8a2 100644
--- a/src/thread/nt32/clone.c
+++ b/src/thread/nt32/clone.c
@@ -59,7 +59,7 @@ int __clone(
 
 	pfn_clone = (__sys_clone *)(__syscall_vtbl[SYS_clone]);
 
-	if (flags == CLONE_VM|CLONE_VFORK|SIGCHLD) {
+	if (flags == (CLONE_VM|CLONE_VFORK|SIGCHLD)) {
 		regs.sbase   = 0;
 		regs.slimit  = 0;
 		regs.sbottom = 0;
diff --git a/src/thread/nt64/clone.c b/src/thread/nt64/clone.c
index 6f11d17..002d709 100644
--- a/src/thread/nt64/clone.c
+++ b/src/thread/nt64/clone.c
@@ -63,7 +63,7 @@ hidden int __clone(
 
 	pfn_clone = (__sys_clone *)(__syscall_vtbl[SYS_clone]);
 
-	if (flags == CLONE_VM|CLONE_VFORK|SIGCHLD) {
+	if (flags == (CLONE_VM|CLONE_VFORK|SIGCHLD)) {
 		regs.sbase   = 0;
 		regs.slimit  = 0;
 		regs.sbottom = 0;