diff --git a/hledger-ui/hledger-ui.cabal b/hledger-ui/hledger-ui.cabal
index 03feb3b30..0de290871 100644
--- a/hledger-ui/hledger-ui.cabal
+++ b/hledger-ui/hledger-ui.cabal
@@ -45,7 +45,7 @@ flag debug
 
 flag threaded
   description: Build with support for multithreaded execution
-  manual: False
+  manual: True
   default: True
 
 library
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index b0d229e38..f6c52ac9c 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -32,7 +32,7 @@ flags:
   threaded:
     description: Build with support for multithreaded execution
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false
diff --git a/hledger-web/hledger-web.cabal b/hledger-web/hledger-web.cabal
index fc30edf94..35876942a 100644
--- a/hledger-web/hledger-web.cabal
+++ b/hledger-web/hledger-web.cabal
@@ -120,17 +120,17 @@ flag debug
 
 flag dev
   description: Turn on development settings, like auto-reload templates.
-  manual: False
+  manual: True
   default: False
 
 flag library-only
   description: Build for use with "yesod devel"
-  manual: False
+  manual: True
   default: False
 
 flag threaded
   description: Build with support for multithreaded execution.
-  manual: False
+  manual: True
   default: True
 
 library
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index b8813f246..37ceb0187 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -50,15 +50,15 @@ flags:
   library-only:
     description: Build for use with "yesod devel"
     default: false
-    manual:  false
+    manual:  true
   dev:
     description: Turn on development settings, like auto-reload templates.
     default: false
-    manual:  false
+    manual:  true
   threaded:
     description: Build with support for multithreaded execution.
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled   # '
     default: false
diff --git a/hledger/hledger.cabal b/hledger/hledger.cabal
index 2e0a62b52..7d433272e 100644
--- a/hledger/hledger.cabal
+++ b/hledger/hledger.cabal
@@ -103,7 +103,7 @@ flag debug
 
 flag threaded
   description: Build with support for multithreaded execution
-  manual: False
+  manual: True
   default: True
 
 library
diff --git a/hledger/package.yaml b/hledger/package.yaml
index 0f912a334..0627018db 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -94,7 +94,7 @@ flags:
   threaded:
     description: Build with support for multithreaded execution
     default: true
-    manual:  false
+    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false