diff --git a/bin/sh/options.c b/bin/sh/options.c
index 56cc5e7397c8..8b501f2d1b6a 100644
--- a/bin/sh/options.c
+++ b/bin/sh/options.c
@@ -131,7 +131,7 @@ procargs(int argc, char **argv)
 void
 optschanged(void)
 {
-	setinteractive(iflag);
+	setinteractive();
 #ifndef NO_HISTORY
 	histedit();
 #endif
diff --git a/bin/sh/trap.c b/bin/sh/trap.c
index d67030d370ac..ba643d3485df 100644
--- a/bin/sh/trap.c
+++ b/bin/sh/trap.c
@@ -478,19 +478,14 @@ dotrap(void)
 
 
 /*
- * Controls whether the shell is interactive or not.
+ * Controls whether the shell is interactive or not based on iflag.
  */
 void
-setinteractive(int on)
+setinteractive(void)
 {
-	static int is_interactive = -1;
-
-	if (on == is_interactive)
-		return;
 	setsignal(SIGINT);
 	setsignal(SIGQUIT);
 	setsignal(SIGTERM);
-	is_interactive = on;
 }
 
 
diff --git a/bin/sh/trap.h b/bin/sh/trap.h
index 8d6cb09c30ba..b9c43f336141 100644
--- a/bin/sh/trap.h
+++ b/bin/sh/trap.h
@@ -43,6 +43,6 @@ void ignoresig(int);
 int issigchldtrapped(void);
 void onsig(int);
 void dotrap(void);
-void setinteractive(int);
+void setinteractive(void);
 void exitshell(int) __dead2;
 void exitshell_savedstatus(void) __dead2;