diff --git a/tools/widl/client.c b/tools/widl/client.c
index 2eaa43c9848..2b102c87827 100644
--- a/tools/widl/client.c
+++ b/tools/widl/client.c
@@ -25,9 +25,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 
 #include "widl.h"
 #include "utils.h"
diff --git a/tools/widl/header.c b/tools/widl/header.c
index 0f697b8a886..0a28fd93558 100644
--- a/tools/widl/header.c
+++ b/tools/widl/header.c
@@ -27,9 +27,7 @@
 # include <unistd.h>
 #endif
 #include <string.h>
-#include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 
 #include "widl.h"
 #include "utils.h"
diff --git a/tools/widl/proxy.c b/tools/widl/proxy.c
index 217c64bf3cd..039f54eaa1e 100644
--- a/tools/widl/proxy.c
+++ b/tools/widl/proxy.c
@@ -28,9 +28,7 @@
 # include <unistd.h>
 #endif
 #include <string.h>
-#include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 
 #include "widl.h"
 #include "utils.h"
diff --git a/tools/widl/server.c b/tools/widl/server.c
index 53dd099cab2..820339639fd 100644
--- a/tools/widl/server.c
+++ b/tools/widl/server.c
@@ -27,9 +27,7 @@
 # include <unistd.h>
 #endif
 #include <string.h>
-#include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 
 #include "widl.h"
 #include "utils.h"
diff --git a/tools/widl/typegen.c b/tools/widl/typegen.c
index 41dd22f2cfd..f3af93571b6 100644
--- a/tools/widl/typegen.c
+++ b/tools/widl/typegen.c
@@ -30,7 +30,6 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 #include <limits.h>
 
 #include "widl.h"
diff --git a/tools/widl/typelib.c b/tools/widl/typelib.c
index 7130e506d77..1a5659981f1 100644
--- a/tools/widl/typelib.c
+++ b/tools/widl/typelib.c
@@ -28,9 +28,7 @@
 #include <stdarg.h>
 #include <unistd.h>
 #include <string.h>
-#include <assert.h>
 #include <ctype.h>
-#include <signal.h>
 
 #define NONAMELESSUNION
 #define NONAMELESSSTRUCT