diff --git a/includes/std/time.pat b/includes/std/time.pat
index 864bb43..40ede8d 100644
--- a/includes/std/time.pat
+++ b/includes/std/time.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 
 namespace std::time {
diff --git a/includes/type/byte.pat b/includes/type/byte.pat
index 9f8597e..18cae0b 100644
--- a/includes/type/byte.pat
+++ b/includes/type/byte.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 
 namespace type {
diff --git a/includes/type/float16.pat b/includes/type/float16.pat
index 0de0b62..b98a2e5 100644
--- a/includes/type/float16.pat
+++ b/includes/type/float16.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 #include <std/math.pat>
 
diff --git a/includes/type/guid.pat b/includes/type/guid.pat
index 912adb6..494a7a5 100644
--- a/includes/type/guid.pat
+++ b/includes/type/guid.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 
 namespace type {
diff --git a/includes/type/ip.pat b/includes/type/ip.pat
index 2ce9212..fb37bed 100644
--- a/includes/type/ip.pat
+++ b/includes/type/ip.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 
 namespace type {
diff --git a/includes/type/mac.pat b/includes/type/mac.pat
index 883e8e7..df1080d 100644
--- a/includes/type/mac.pat
+++ b/includes/type/mac.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 
 namespace type {
diff --git a/includes/type/time.pat b/includes/type/time.pat
index c36e1e3..80298a9 100644
--- a/includes/type/time.pat
+++ b/includes/type/time.pat
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <std/io.pat>
 #include <std/time.pat>