diff --git a/hledger-ui/hledger-ui.cabal b/hledger-ui/hledger-ui.cabal
index 0de290871..521438a94 100644
--- a/hledger-ui/hledger-ui.cabal
+++ b/hledger-ui/hledger-ui.cabal
@@ -43,11 +43,6 @@ flag debug
   manual: True
   default: False
 
-flag threaded
-  description: Build with support for multithreaded execution
-  manual: True
-  default: True
-
 library
   exposed-modules:
       Hledger.UI
@@ -124,7 +119,7 @@ executable hledger-ui
       Paths_hledger_ui
   hs-source-dirs:
       app
-  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind
+  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -threaded
   cpp-options: -DVERSION="1.50.99"
   build-depends:
       base >=4.18 && <4.22
@@ -132,5 +127,3 @@ executable hledger-ui
   default-language: GHC2021
   if (flag(debug))
     cpp-options: -DDEBUG
-  if flag(threaded)
-    ghc-options: -threaded
diff --git a/hledger-ui/package.yaml b/hledger-ui/package.yaml
index f6c52ac9c..566390fc5 100644
--- a/hledger-ui/package.yaml
+++ b/hledger-ui/package.yaml
@@ -29,10 +29,6 @@ extra-source-files:
 - hledger-ui.info
 
 flags:
-  threaded:
-    description: Build with support for multithreaded execution
-    default: true
-    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false
@@ -112,8 +108,7 @@ executables:
   hledger-ui:
     source-dirs: app
     main: hledger-ui.hs
-    when:
-    - condition: flag(threaded)
-      ghc-options: -threaded
+    # -threaded is needed for runPager, at least
+    ghc-options: -threaded
     dependencies:
     - hledger-ui
diff --git a/hledger-web/hledger-web.cabal b/hledger-web/hledger-web.cabal
index 35876942a..ee125b3a4 100644
--- a/hledger-web/hledger-web.cabal
+++ b/hledger-web/hledger-web.cabal
@@ -128,11 +128,6 @@ flag library-only
   manual: True
   default: False
 
-flag threaded
-  description: Build with support for multithreaded execution.
-  manual: True
-  default: True
-
 library
   exposed-modules:
       Hledger.Web
@@ -158,7 +153,7 @@ library
       Paths_hledger_web
   hs-source-dirs:
       ./
-  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind
+  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -threaded
   cpp-options: -DVERSION="1.50.99"
   build-depends:
       Decimal >=0.5.1
@@ -211,8 +206,6 @@ library
     , yesod-static >=1.4 && <1.7
     , yesod-test
   default-language: GHC2021
-  if flag(threaded)
-    ghc-options: -threaded
   if (flag(dev)) || (flag(library-only))
     cpp-options: -DDEVELOPMENT
   if flag(dev)
@@ -228,14 +221,12 @@ executable hledger-web
       Paths_hledger_web
   hs-source-dirs:
       app
-  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind
+  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -threaded
   cpp-options: -DVERSION="1.50.99"
   build-depends:
       base >=4.18 && <4.22
     , hledger-web
   default-language: GHC2021
-  if flag(threaded)
-    ghc-options: -threaded
   if (flag(dev)) || (flag(library-only))
     cpp-options: -DDEVELOPMENT
   if flag(dev)
@@ -250,14 +241,12 @@ test-suite apptest
   main-is: test.hs
   hs-source-dirs:
       test
-  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind
+  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -threaded
   cpp-options: -DVERSION="1.50.99"
   build-depends:
       base >=4.18 && <4.22
     , hledger-web
   default-language: GHC2021
-  if flag(threaded)
-    ghc-options: -threaded
   if (flag(dev)) || (flag(library-only))
     cpp-options: -DDEVELOPMENT
   if flag(dev)
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index 37ceb0187..69cd8e9a2 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -55,10 +55,6 @@ flags:
     description: Turn on development settings, like auto-reload templates.
     default: false
     manual:  true
-  threaded:
-    description: Build with support for multithreaded execution.
-    default: true
-    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled   # '
     default: false
@@ -82,12 +78,10 @@ ghc-options:
 - -Wno-orphans
 - -Wno-type-defaults
 - -Wno-unused-do-bind
+- -threaded  # needed for runPager & probably other things
 
 when:
 
-- condition: flag(threaded)
-  ghc-options: -threaded
-
 - condition: (flag(dev)) || (flag(library-only))
   cpp-options: -DDEVELOPMENT
 
diff --git a/hledger/hledger.cabal b/hledger/hledger.cabal
index 7d433272e..b003cb15d 100644
--- a/hledger/hledger.cabal
+++ b/hledger/hledger.cabal
@@ -101,11 +101,6 @@ flag debug
   manual: True
   default: False
 
-flag threaded
-  description: Build with support for multithreaded execution
-  manual: True
-  default: True
-
 library
   exposed-modules:
       Hledger.Cli
@@ -212,7 +207,7 @@ executable hledger
       Paths_hledger
   hs-source-dirs:
       app
-  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -optP-Wno-nonportable-include-path -with-rtsopts=-T
+  ghc-options: -Wall -Wno-incomplete-uni-patterns -Wno-missing-signatures -Wno-orphans -Wno-type-defaults -Wno-unused-do-bind -optP-Wno-nonportable-include-path -threaded -with-rtsopts=-T
   cpp-options: -DVERSION="1.50.99"
   build-depends:
       Decimal >=0.5.1
@@ -257,8 +252,6 @@ executable hledger
   default-language: GHC2021
   if (flag(debug))
     cpp-options: -DDEBUG
-  if flag(threaded)
-    ghc-options: -threaded
 
 test-suite unittest
   type: exitcode-stdio-1.0
diff --git a/hledger/package.yaml b/hledger/package.yaml
index 0627018db..87231af75 100644
--- a/hledger/package.yaml
+++ b/hledger/package.yaml
@@ -91,10 +91,6 @@ extra-source-files:
 - Hledger/Cli/Commands/Test.txt
 
 flags:
-  threaded:
-    description: Build with support for multithreaded execution
-    default: true
-    manual:  true
   debug:
     description: Build with GHC 9.10+ stack traces enabled
     default: false
@@ -223,10 +219,9 @@ executables:
   hledger:
     source-dirs: app
     main: hledger-cli.hs
-    ghc-options: -with-rtsopts=-T  # for stats command
-    when:
-    - condition: flag(threaded)
-      ghc-options: -threaded
+    # -threaded is needed for runPager, at least
+    # -T is for the stats command
+    ghc-options: -threaded -with-rtsopts=-T
     dependencies:
     - hledger