diff --git a/Dockerfile b/Dockerfile
index df077c4..cd614e7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -97,6 +97,7 @@ ENV PATH=${OPTICKS_PREFIX}/bin:${OPTICKS_PREFIX}/lib:${PATH}
 ENV NVIDIA_DRIVER_CAPABILITIES=graphics,compute,utility
 ENV VIRTUAL_ENV_DISABLE_PROMPT=1
 ENV TMP=/tmp
+ENV CMAKE_PREFIX_PATH=${OPTICKS_PREFIX}
 
 WORKDIR $ESI_DIR