diff --git a/.env.sample b/.env.sample
index 63685bc..9d878a9 100644
--- a/.env.sample
+++ b/.env.sample
@@ -11,7 +11,7 @@ PREPROCESS_DB_USERNAME=             # username for the source database
 PREPROCESS_DB_PASSWORD=             # password for the source database
 PREPROCESS_DB_CDM_SCHEMA=           # Schema name in the database to connect the OMOP CDM to
 PREPROCESS_SUMMARISE_LEVEL=monthly  # Level to summarise record counts at (monthly or quarterly)
-PREPROCESS_BUILD_CORES=4            # Number of cores to use for make in docker build
+BUILD_CORES_MAKE=4                  # Number of cores to use for make in docker build
 
 # Low-frequency replacement
 LOW_FREQUENCY_THRESHOLD=10
diff --git a/docker-compose.yml b/docker-compose.yml
index 6cb7aa2..9f7a37c 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,7 +7,7 @@ services:
         # Required for running on GAE
         HTTP_PROXY: ${HTTP_PROXY}
         HTTPS_PROXY: ${HTTPS_PROXY}
-        CORES: ${PREPROCESS_BUILD_CORES}
+        CORES: ${BUILD_CORES_MAKE}
     image: omopcat_preprocessing:latest
     platform: linux/amd64
     environment:
@@ -37,7 +37,7 @@ services:
         # Required for running on GAE
         HTTP_PROXY: ${HTTP_PROXY}
         HTTPS_PROXY: ${HTTPS_PROXY}
-        CORES: ${PREPROCESS_BUILD_CORES}
+        CORES: ${BUILD_CORES_MAKE}
     image: omopcat:latest
     platform: linux/amd64
     restart: unless-stopped
diff --git a/public.env.sample b/public.env.sample
index db20f8e..9b394e0 100644
--- a/public.env.sample
+++ b/public.env.sample
@@ -11,7 +11,8 @@ PREPROCESS_DB_USERNAME=             # username for the source database
 PREPROCESS_DB_PASSWORD=             # password for the source database
 PREPROCESS_DB_CDM_SCHEMA=           # Schema name in the database to connect the OMOP CDM to
 PREPROCESS_SUMMARISE_LEVEL=quarterly  # Level to summarise record counts at (monthly or quarterly)
-PREPROCESS_BUILD_CORES=4            # Number of cores to use for make in docker build
+BUILD_CORES_MAKE=4                  # Number of cores to use for make in docker build
+
 # Low-frequency replacement
 LOW_FREQUENCY_THRESHOLD=10
 LOW_FREQUENCY_REPLACEMENT=9.99