diff --git a/src/conda_packages.sh b/src/conda_packages.sh
index bf3a73c0a38775ab87904686be0633dde4b4d3d8..f625afa99712fc7040ce97c2805e6745380c7312 100644
--- a/src/conda_packages.sh
+++ b/src/conda_packages.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 function install_env {
-  if [ -d "${CONDA_PREFIX}/envs/${1}_${2}" ]; then
+  if [ ! -d "${CONDA_PREFIX}/envs/${1}_${2}" ]; then
     install_env ${1}_${2} ${3}
   fi
 }