diff --git a/.github/configs b/.github/configs
index d9eb54d7e..f28811c17 100755
--- a/.github/configs
+++ b/.github/configs
@@ -156,7 +156,7 @@ esac
 
 # Unless specified otherwise, build without OpenSSL on Mac OS since
 # modern versions don't ship with libcrypto.
-case $(./config.guess) in
+case "`./config.guess`" in
 *-darwin*)
 	LIBCRYPTOFLAGS="--without-openssl"
 	TEST_TARGET=t-exec
diff --git a/.github/setup_ci.sh b/.github/setup_ci.sh
index d9e4a906f..df4bd97f1 100755
--- a/.github/setup_ci.sh
+++ b/.github/setup_ci.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-case $(./config.guess) in
+case "`./config.guess`" in
 *-darwin*)
 	brew install automake
 	exit 0