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-rw-r--r--Src/zsh.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/zsh.h b/Src/zsh.h
index 7617e2281..5618174a8 100644
--- a/Src/zsh.h
+++ b/Src/zsh.h
@@ -2043,7 +2043,7 @@ struct ttyinfo {
 
 #define txtchangeisset(T,X)	((T) & (X))
 #define txtchangeget(T,A)	(((T) & A ## _MASK) >> A ## _SHIFT)
-#define txtchangeset(X, Y)	(txtchange |= (X), txtchange &= ~(Y))
+#define txtchangeset(T, X, Y)	((void)(T && (*T |= (X), *T &= ~(Y))))
 
 /*
  * For outputting sequences to change colour: specify foreground