diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fac110aa1eac4afb9e9b087f17865d6d722cbffe..b85a8639ab2ac000c1f5d85efd20ec88c0707fc3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -333,6 +333,7 @@ test:offline:
     #- yum -y install texlive-base texlive-dvipng
     #- yum -y install texlive-latex texlive-latex-base-doc texlive-latex-fonts texlive-latex-bin texlive-latex-bin-bin
     #- yum -y install texlive-pictures texlive-pstricks texlive-pstricks-doc
+    yum -y install bc
     
     # Get the necessary ROM data:
     - git clone https://git.ligo.org/alexander-pace/gstlal-testing-data.git ${GSTLAL_DIR}/gstlal-testing-data