diff --git a/contrib/packages/rpm/el5/SPECS/tigervnc.spec b/contrib/packages/rpm/el5/SPECS/tigervnc.spec
index 1b88670..6da5915 100644
--- a/contrib/packages/rpm/el5/SPECS/tigervnc.spec
+++ b/contrib/packages/rpm/el5/SPECS/tigervnc.spec
@@ -1,5 +1,6 @@
 %define _default_patch_fuzz 2
 %define mesa_version 7.7.1
+%{!?_self_signed: %define _self_signed 1}
 
 Name: tigervnc
 Version: @VERSION@
@@ -1110,7 +1111,7 @@
 # Build Java applet
 pushd java
 %{cmake28} \
-%if 0%{!?_self_signed:1}
+%if !%{_self_signed}
 	-DJAVA_KEYSTORE=%{_keystore} \
 	-DJAVA_KEYSTORE_TYPE=%{_keystore_type} \
 	-DJAVA_KEY_ALIAS=%{_key_alias} \
diff --git a/contrib/packages/rpm/el6/SPECS/tigervnc.spec b/contrib/packages/rpm/el6/SPECS/tigervnc.spec
index da8ce73..3667979 100644
--- a/contrib/packages/rpm/el6/SPECS/tigervnc.spec
+++ b/contrib/packages/rpm/el6/SPECS/tigervnc.spec
@@ -1,3 +1,5 @@
+%{!?_self_signed: %define _self_signed 1}
+
 Name: tigervnc
 Version: @VERSION@
 Release: 18%{?snap:.%{snap}}%{?dist}
@@ -217,7 +219,7 @@
 # Build Java applet
 pushd java
 %{cmake28} \
-%if 0%{!?self_signed:1}
+%if !%{_self_signed}
 	-DJAVA_KEYSTORE=%{_keystore} \
 	-DJAVA_KEYSTORE_TYPE=%{_keystore_type} \
 	-DJAVA_KEY_ALIAS=%{_key_alias} \
diff --git a/contrib/packages/rpm/sle11/SPECS/tigervnc.spec b/contrib/packages/rpm/sle11/SPECS/tigervnc.spec
index f98e8fb..84e8574 100644
--- a/contrib/packages/rpm/sle11/SPECS/tigervnc.spec
+++ b/contrib/packages/rpm/sle11/SPECS/tigervnc.spec
@@ -15,6 +15,7 @@
 # Please submit bugfixes or comments via http://bugs.opensuse.org/
 #
 %define         debug_package %{nil}
+%{!?_self_signed: %define _self_signed 1}
 
 
 Name:           tigervnc
@@ -316,7 +317,7 @@
 # Build java client
 pushd java
 cmake -DCMAKE_INSTALL_PREFIX:PATH=%{_prefix} \
-%if 0%{!?_self_signed:1}
+%if !%{_self_signed}
   -DJAVA_KEYSTORE=%{_keystore} \
   -DJAVA_KEYSTORE_TYPE=%{_keystore_type} \
   -DJAVA_KEY_ALIAS=%{_key_alias} \