diff --git a/src/cmd/cc/dpchk.c b/src/cmd/cc/dpchk.c
index 42c245b566..084aa04846 100644
--- a/src/cmd/cc/dpchk.c
+++ b/src/cmd/cc/dpchk.c
@@ -29,7 +29,6 @@
 // THE SOFTWARE.
 
 #include	<u.h>
-#include	<ctype.h>
 #include	"cc.h"
 #include	"y.tab.h"
 
diff --git a/src/cmd/cc/lex.c b/src/cmd/cc/lex.c
index 15f2d374d1..9fb2f9e4d5 100644
--- a/src/cmd/cc/lex.c
+++ b/src/cmd/cc/lex.c
@@ -29,7 +29,6 @@
 // THE SOFTWARE.
 
 #include	<u.h>
-#include	<ctype.h>
 #include	"cc.h"
 #include	"y.tab.h"
 
diff --git a/src/cmd/cc/mac.c b/src/cmd/cc/mac.c
index 43ae214d7e..b969662ae7 100644
--- a/src/cmd/cc/mac.c
+++ b/src/cmd/cc/mac.c
@@ -29,7 +29,6 @@
 // THE SOFTWARE.
 
 #include	<u.h>
-#include	<ctype.h>
 #include	"cc.h"
 
 #include	"macbody"