diff --git a/Makefile b/Makefile
index df723a504..93933bbbe 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ $(targets):
 wasm32-update:
 	wasm32-wasi-cabal update
 
-wasm32 = wasm32-build wasm32-build-opt wasm32-configure wasm32-check wasm32-test wasm32-test-opt wasm32-clean
+wasm32 = discover-wasm32-tests wasm32-build wasm32-build-opt wasm32-configure wasm32-check wasm32-test wasm32-test-opt wasm32-clean
 
 $(wasm32):
 	$(MAKE) -C primer $@
diff --git a/cabal.project b/cabal.project
index 89c8f8f6a..d022eb16d 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,5 +1,7 @@
 index-state: 2024-02-06T00:00:00Z
 
+jobs: $ncpus
+
 packages:
   primer
   primer-api
@@ -13,11 +15,22 @@ if arch(wasm32)
 else
   optimization: 0
 
+benchmarks: True
+
+tests: True
+
+if !arch(wasm32)
+  documentation:            True
+  haddock-hoogle:           True
+  haddock-html:             True
+  haddock-quickjump:        True
+  haddock-hyperlink-source: True
+  haddock-internal:         True
+
 allow-newer: hedgehog-classes:hedgehog,hedgehog-classes:pretty-show,hedgehog:pretty-show
 
 package *
   ghc-options: -fwrite-ide-info
-  benchmarks: True
 
 package primer
   test-options: "--size-cutoff=32768"
diff --git a/flake.nix b/flake.nix
index 67e0748c3..4068a4498 100644
--- a/flake.nix
+++ b/flake.nix
@@ -326,6 +326,12 @@
                   # time, because we can't do it via `wasmtime`.
                   (pkgs.haskell-nix.tool ghcVersion "tasty-discover" { })
                 ];
+
+              # The wasm32 compile target can't discover its own Tasty
+              # tests.
+              shellHook = ''
+                make discover-wasm32-tests
+              '';
             };
           };
 
diff --git a/primer-api/Makefile b/primer-api/Makefile
index ee663a006..bb95112c6 100644
--- a/primer-api/Makefile
+++ b/primer-api/Makefile
@@ -28,13 +28,14 @@ wasm32-check:	wasm32-test
 test:
 	cabal test
 
-wasm32-test:
+discover-wasm32-tests:
 	tasty-discover test/Test.hs _ test/TestsWasm32.hs --tree-display
+
+wasm32-test: wasm32-build discover-wasm32-tests
 	wasm32-wasi-cabal build test:primer-api-test
 	wasmtime --dir test::test "$(wasm32-primer-api-test)"
 
-wasm32-test-opt: wasm32-build-opt
-	tasty-discover test/Test.hs _ test/TestsWasm32.hs --tree-display
+wasm32-test-opt: wasm32-build-opt discover-wasm32-tests
 	wasm32-wasi-cabal build -O2 test:primer-api-test
 	wasmtime --dir test::test "$(wasm32-primer-api-test-opt)"
 
@@ -53,4 +54,4 @@ realclean:
 
 deps:
 
-.PHONY: build bench configure test docs clean realclean deps
+.PHONY: build bench configure test docs clean realclean deps discover-wasm32-tests
diff --git a/primer/Makefile b/primer/Makefile
index 791620a5e..2ea525f66 100644
--- a/primer/Makefile
+++ b/primer/Makefile
@@ -28,13 +28,14 @@ wasm32-check:	wasm32-test
 test:
 	cabal test
 
-wasm32-test:
+discover-wasm32-tests:
 	tasty-discover test/Test.hs _ test/TestsWasm32.hs --tree-display
+
+wasm32-test: wasm32-build discover-wasm32-tests
 	wasm32-wasi-cabal build test:primer-test
 	wasmtime --dir test::test "$(wasm32-primer-test)"
 
-wasm32-test-opt: wasm32-build-opt
-	tasty-discover test/Test.hs _ test/TestsWasm32.hs --tree-display
+wasm32-test-opt: wasm32-build-opt discover-wasm32-tests
 	wasm32-wasi-cabal build -O2 test:primer-test
 	wasmtime --dir test::test "$(wasm32-primer-test-opt)"