diff --git a/lib/backends/s3.bash b/lib/backends/s3.bash
index cd8cee3..dda6755 100644
--- a/lib/backends/s3.bash
+++ b/lib/backends/s3.bash
@@ -2,19 +2,19 @@
 
 # Defaults...
 AWS_ARGS=""
-COMPRESS=${BUILDKITE_PLUGIN_CACHE_S3_COMPRESS:-false}
+BK_CACHE_COMPRESS=${BUILDKITE_PLUGIN_CACHE_S3_COMPRESS:-false}
 TAR_ARGS="--ignore-failed-read -cf"
 TAR_EXTENSION="tar"
 TAR_EXTRACT_ARGS="-xf"
 
-if [[ ! "${COMPRESS:-false}" =~ (false) ]]; then
+if [[ ! "${BK_CACHE_COMPRESS:-false}" =~ (false) ]]; then
   TAR_ARGS="--ignore-failed-read -zcf"
   TAR_EXTENSION="tar.gz"
   TAR_EXTRACT_ARGS="-xzf"
 fi
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
-  if [[ ! "${COMPRESS:-false}" =~ (false) ]]; then
+  if [[ ! "${BK_CACHE_COMPRESS:-false}" =~ (false) ]]; then
     TAR_ARGS="-zcf"
   else
     TAR_ARGS="-cf"
diff --git a/lib/backends/tarball.bash b/lib/backends/tarball.bash
index 5eaed66..7d6a4ac 100644
--- a/lib/backends/tarball.bash
+++ b/lib/backends/tarball.bash
@@ -1,19 +1,19 @@
 #!/bin/bash
 
 # Defaults...
-COMPRESS=${BUILDKITE_PLUGIN_CACHE_TARBALL_COMPRESS:-false}
+BK_CACHE_COMPRESS=${BUILDKITE_PLUGIN_CACHE_TARBALL_COMPRESS:-false}
 TAR_ARGS="--ignore-failed-read -cf"
 TAR_EXTENSION="tar"
 TAR_EXTRACT_ARGS="-xf"
 
-if [[ ! "${COMPRESS:-false}" =~ (false) ]]; then
+if [[ ! "${BK_CACHE_COMPRESS:-false}" =~ (false) ]]; then
   TAR_ARGS="--ignore-failed-read -zcf"
   TAR_EXTENSION="tar.gz"
   TAR_EXTRACT_ARGS="-xzf"
 fi
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
-  if [[ ! "${COMPRESS:-false}" =~ (false) ]]; then
+  if [[ ! "${BK_CACHE_COMPRESS:-false}" =~ (false) ]]; then
     TAR_ARGS="-zcf"
   else
     TAR_ARGS="-cf"