diff --git a/coin/instructions/prepare_building_env.yaml b/coin/instructions/prepare_building_env.yaml
index b05592f5e32..d8243e7a12f 100644
--- a/coin/instructions/prepare_building_env.yaml
+++ b/coin/instructions/prepare_building_env.yaml
@@ -265,7 +265,7 @@ instructions:
     instructions:
     # Need to unset QMAKESPEC, so that the pre-installed boot2qt mkspec is not picked up.
     - type: WriteFile
-      fileContents: "#!/bin/bash\nunset LD_LIBRARY_PATH\n. {{.Env.QT_YOCTO_ENVSETUP}}\nexport PATH={{.Env.QT_CMAKE_DIR}}:$PATH;\nunset QMAKESPEC\n$*"
+      fileContents: "#!/bin/bash\nunset LD_LIBRARY_PATH\n. {{.Env.QT_YOCTO_ENVSETUP}}\nexport PATH={{.Env.QT_CMAKE_DIR}}:$PATH;\nunset QMAKESPEC\n\"$@\""
       filename: "{{.Env.HOME}}/prefix.sh"
       fileMode: 493
       maxTimeInSeconds: 20