diff --git a/Network/Wai/Application/Classic/CGI.hs b/Network/Wai/Application/Classic/CGI.hs
--- a/Network/Wai/Application/Classic/CGI.hs
+++ b/Network/Wai/Application/Classic/CGI.hs
@@ -127,6 +127,9 @@
       , child_group = Nothing
       , child_user = Nothing
 #endif
+#if __GLASGOW_HASKELL__ >= 802
+      , use_process_jobs = False
+#endif
       }
     (prog, scriptName, pathinfo) =
         pathinfoToCGI (cgiSrc cgii)
diff --git a/wai-app-file-cgi.cabal b/wai-app-file-cgi.cabal
--- a/wai-app-file-cgi.cabal
+++ b/wai-app-file-cgi.cabal
@@ -1,5 +1,5 @@
 Name:                   wai-app-file-cgi
-Version:                3.1.7
+Version:                3.1.8
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -66,6 +66,8 @@
                       , wai-conduit
                       , warp >= 3.2.21 && < 3.3
                       , word8
+  if impl(ghc >= 8)
+    Default-Extensions:  Strict StrictData
 
 Test-Suite doctest
   Type:                 exitcode-stdio-1.0
@@ -75,6 +77,8 @@
   Main-Is:              doctests.hs
   Build-Depends:        base
                       , doctest >= 0.9.3
+  if impl(ghc >= 8)
+    Default-Extensions:  Strict StrictData
 
 Test-Suite spec
   Type:                 exitcode-stdio-1.0
@@ -96,6 +100,8 @@
                       , wai-app-file-cgi
                       , warp >= 3.2.6 && < 3.3
                       , HTTP
+  if impl(ghc >= 8)
+    Default-Extensions:  Strict StrictData
 
 Source-Repository head
   Type:                 git