diff --git a/pkgs/development/libraries/cfitsio/default.nix b/pkgs/development/libraries/cfitsio/default.nix
index a430bc317930..a3263f653b75 100644
--- a/pkgs/development/libraries/cfitsio/default.nix
+++ b/pkgs/development/libraries/cfitsio/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   patches = [ ./darwin-rpath-universal.patch ];
 
-  configureFlags = "--with-bzip2=${bzip2.out}";
+  configureFlags = [ "--with-bzip2=${bzip2.out}" ];
 
   hardeningDisable = [ "format" ];