diff --git a/Library/Homebrew/shims/mac/super/pod2man b/Library/Homebrew/shims/mac/super/pod2man
index 1ad2cd2018..468f33259e 100755
--- a/Library/Homebrew/shims/mac/super/pod2man
+++ b/Library/Homebrew/shims/mac/super/pod2man
@@ -1,8 +1,10 @@
 #!/bin/bash
 
+# HOMEBREW_PREFIX is set by bin/brew
+# shellcheck disable=SC2154
 POD2MAN="$(type -P pod2man5.18 ||
            type -P pod2man5.16 ||
            type -P pod2man5.12 ||
-           type -P "$HOMEBREW_PREFIX/opt/pod2man/bin/pod2man" ||
+           type -P "${HOMEBREW_PREFIX}/opt/pod2man/bin/pod2man" ||
            echo /usr/bin/pod2man)"
-exec "$POD2MAN" "$@"
+exec "${POD2MAN}" "$@"