diff --git a/compiler/c++.capnp.c b/compiler/c++.capnp.c
index f362d4b..f088ac4 100644
--- a/compiler/c++.capnp.c
+++ b/compiler/c++.capnp.c
@@ -2,7 +2,7 @@
 /* AUTO GENERATED - DO NOT EDIT */
 #ifdef __GNUC__
 # define capnp_unused __attribute__((unused))
-# define capnp_use(x) (void) x;
+# define capnp_use(x) (void) (x);
 #else
 # define capnp_unused
 # define capnp_use(x)
diff --git a/compiler/c.capnp.c b/compiler/c.capnp.c
index 205311c..c94af4c 100644
--- a/compiler/c.capnp.c
+++ b/compiler/c.capnp.c
@@ -2,7 +2,7 @@
 /* AUTO GENERATED - DO NOT EDIT */
 #ifdef __GNUC__
 # define capnp_unused __attribute__((unused))
-# define capnp_use(x) (void) x;
+# define capnp_use(x) (void) (x);
 #else
 # define capnp_unused
 # define capnp_use(x)
diff --git a/compiler/capnpc-c.c b/compiler/capnpc-c.c
index 649690f..a624890 100644
--- a/compiler/capnpc-c.c
+++ b/compiler/capnpc-c.c
@@ -1597,7 +1597,7 @@ int main() {
 		fprintf(srcf, "/* AUTO GENERATED - DO NOT EDIT */\n");
 		fprintf(srcf, "#ifdef __GNUC__\n"
 				"# define capnp_unused __attribute__((unused))\n"
-				"# define capnp_use(x) (void) x;\n"
+				"# define capnp_use(x) (void) (x);\n"
 				"#else\n"
 				"# define capnp_unused\n"
 				"# define capnp_use(x)\n"
diff --git a/compiler/schema.capnp.c b/compiler/schema.capnp.c
index b49645f..8bcbcc5 100644
--- a/compiler/schema.capnp.c
+++ b/compiler/schema.capnp.c
@@ -2,7 +2,7 @@
 /* AUTO GENERATED - DO NOT EDIT */
 #ifdef __GNUC__
 # define capnp_unused __attribute__((unused))
-# define capnp_use(x) (void) x;
+# define capnp_use(x) (void) (x);
 #else
 # define capnp_unused
 # define capnp_use(x)
diff --git a/compiler/test.capnp.c b/compiler/test.capnp.c
index 6962a3d..97a026c 100644
--- a/compiler/test.capnp.c
+++ b/compiler/test.capnp.c
@@ -2,7 +2,7 @@
 /* AUTO GENERATED - DO NOT EDIT */
 #ifdef __GNUC__
 # define capnp_unused __attribute__((unused))
-# define capnp_use(x) (void) x;
+# define capnp_use(x) (void) (x);
 #else
 # define capnp_unused
 # define capnp_use(x)