diff --git a/build.sh b/build.sh
index c9ffc1b..3e5e40d 100755
--- a/build.sh
+++ b/build.sh
@@ -66,7 +66,7 @@ if [ ! -f "$HERE/build/jna-platform.jar" ]; then
 fi
 
 if [ ! -f "$HERE/build/i2pfirefox.jar" ]; then
-  wget -O "$HERE/build/i2pfirefox.jar" https://github.com/eyedeekay/i2p.plugins.firefox/releases/download/0.0.21/i2pfirefox.jar
+  wget -O "$HERE/build/i2pfirefox.jar" "https://github.com/eyedeekay/i2p.plugins.firefox/releases/$I2PFIREFOX_VERSION/0.0.21/i2pfirefox.jar"
 fi
 
 cd java
diff --git a/i2pversion b/i2pversion
index e761b08..4c0646e 100644
--- a/i2pversion
+++ b/i2pversion
@@ -2,7 +2,8 @@
 
 JNA_VERSION=5.11.0
 export JNA_VERSION=5.11.0
-
+I2PFIREFOX_VERSION=0.0.21
+export I2PFIREFOX_VERSION=0.0.21
 #Comment this out to build from an alternate branch or
 # the tip of the master branch.
 VERSIONMAJOR=1