3 files changed, 6 insertions, 0 deletions
diff --git a/Libraries/LibCore/Forward.h b/Libraries/LibCore/Forward.h
index 8725e91d5c..56b99b8c85 100644
--- a/Libraries/LibCore/Forward.h
+++ b/Libraries/LibCore/Forward.h
@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 namespace Core {
 
 class ArgsParser;
diff --git a/Libraries/LibCore/Gzip.h b/Libraries/LibCore/Gzip.h
index 54232ef6b7..a96af59536 100644
--- a/Libraries/LibCore/Gzip.h
+++ b/Libraries/LibCore/Gzip.h
@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <AK/ByteBuffer.h>
 #include <AK/Optional.h>
 #include <AK/String.h>
diff --git a/Libraries/LibCore/puff.h b/Libraries/LibCore/puff.h
index f778ea319a..5943910403 100644
--- a/Libraries/LibCore/puff.h
+++ b/Libraries/LibCore/puff.h
@@ -1,3 +1,5 @@
+#pragma once
+
 /* puff.h
   Copyright (C) 2002-2013 Mark Adler, all rights reserved
   version 2.3, 21 Jan 2013