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-rw-r--r--src/libthread/thread.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libthread/thread.c b/src/libthread/thread.c
index 9b47e769..4e3e473c 100644
--- a/src/libthread/thread.c
+++ b/src/libthread/thread.c
@@ -86,7 +86,7 @@ threadstart(uint y, uint x)
_Thread *t;
ulong z;
- z = x<<16; /* hide undefined 32-bit shift from 32-bit compilers */
+ z = (ulong)x << 16; /* hide undefined 32-bit shift from 32-bit compilers */
z <<= 16;
z |= y;
t = (_Thread*)z;