diff --git a/tests/protoc.sh b/tests/protoc.sh
index 054c8b6..4bf0893 100644
--- a/tests/protoc.sh
+++ b/tests/protoc.sh
@@ -1,8 +1,8 @@
-#!/bin/bash -eu
+#! @shell@ -eu
 
 pyTmpDir=$1
 
-python                          \
+@python@/bin/python             \
     -m grpc.tools.protoc        \
     -I tests                    \
     --python_out=$pyTmpDir      \
diff --git a/tests/simple-server.sh b/tests/simple-server.sh
index 37a0a63..8e8fb66 100755
--- a/tests/simple-server.sh
+++ b/tests/simple-server.sh
@@ -1,8 +1,8 @@
-#!/bin/bash -eu
+#! @shell@ -eu
 
 hsTmpDir=$1
 
-stack ghc --                   \
+@ghc@/bin/ghc                  \
     --make                     \
     -threaded                  \
     -odir $hsTmpDir            \