diff --git a/.github/workflows/linux-package.yml b/.github/workflows/linux-package.yml
index 1073793b86a..3efc3db9c2d 100644
--- a/.github/workflows/linux-package.yml
+++ b/.github/workflows/linux-package.yml
@@ -382,8 +382,8 @@ jobs:
               fi
             fi
             if [ -n "'$SUDO_USER'" ]; then
-                if ! getent group ${BOINCGROUP} | grep -q '$SUDO_USER'; then
-                    usermod -a -G ${BOINCGROUP} '$SUDO_USER'
+                if ! getent group ${BOINCGROUP} | grep -q "'$SUDO_USER'"; then
+                    usermod -a -G ${BOINCGROUP} "'$SUDO_USER'"
                 fi
             fi