diff --git a/lfs/calamaris b/lfs/calamaris
index 2022f84f8..32858526a 100644
--- a/lfs/calamaris
+++ b/lfs/calamaris
@@ -1,7 +1,7 @@
 ###############################################################################
 #                                                                             #
 # IPFire.org - A linux based firewall                                         #
-# Copyright (C) 2007-2018  IPFire Team  <info@ipfire.org>                     #
+# Copyright (C) 2007-2019  IPFire Team  <info@ipfire.org>                     #
 #                                                                             #
 # This program is free software: you can redistribute it and/or modify        #
 # it under the terms of the GNU General Public License as published by        #
@@ -70,6 +70,9 @@ $(subst %,%_MD5,$(objects)) :
 $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	@$(PREBUILD)
 	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar zxf $(DIR_DL)/$(DL_FILE)
+
+	cd $(DIR_APP) && patch -Np1 -i $(DIR_SRC)/src/patches/calamaris/01_calamaris_cant_use_defined_hash.patch
+
 	cd $(DIR_APP) && cp -f calamaris $(DIR_SRC)/config/calamaris/mkreport \
 			/var/ipfire/proxy/calamaris/bin/
 	chmod 755 /var/ipfire/proxy/calamaris/bin/{calamaris,mkreport}
diff --git a/src/patches/calamaris/01_calamaris_cant_use_defined_hash.patch b/src/patches/calamaris/01_calamaris_cant_use_defined_hash.patch
new file mode 100644
index 000000000..64d66276c
--- /dev/null
+++ b/src/patches/calamaris/01_calamaris_cant_use_defined_hash.patch
@@ -0,0 +1,12 @@
+diff U3 a/calamaris b/calamaris
+--- a/calamaris	Sun Jun  6 18:26:14 2004
++++ b/calamaris	Wed Nov 13 19:59:15 2019
+@@ -2606,7 +2606,7 @@
+ 	    100, 100 * $tcp_hit / $tcp );
+   }
+   outstop(10);
+-  if ( defined(%tcp_content) ) {
++  if (%tcp_content) {
+     outstart(11);
+     if ( $tcp == 0 ) {
+       outline( 11, 'no matching requests' );