diff --git a/CHANGES b/CHANGES
index a051c4c5c1..26b803c8c8 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,8 @@
 
+3.1.0-dev.240 | 2019-11-01 15:58:55 -0700
+
+  * Use #pragma once in Base64.h (Jon Siwek, Corelight)
+
 3.1.0-dev.239 | 2019-10-31 12:18:16 -0700
 
   * Fix Travis CI script to run Coverity build in container (Jon Siwek, Corelight)
diff --git a/VERSION b/VERSION
index 1b7d1a0c23..9f78495e7b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.1.0-dev.239
+3.1.0-dev.240
diff --git a/src/Base64.h b/src/Base64.h
index 04df1aca49..5d2006de6b 100644
--- a/src/Base64.h
+++ b/src/Base64.h
@@ -1,5 +1,4 @@
-#ifndef base64_h
-#define base64_h
+#pragma once
 
 #include <assert.h>
 #include <stdio.h>
@@ -71,5 +70,3 @@ protected:
 
 BroString* decode_base64(const BroString* s, const BroString* a = 0, Connection* conn = 0);
 BroString* encode_base64(const BroString* s, const BroString* a = 0, Connection* conn = 0);
-
-#endif /* base64_h */