diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f324531..2d5716d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -111,8 +111,6 @@ jobs:
         npm install --skip-proj-native --build-wasm-from-source --verbose --foreground-scripts  \
           ${{ inputs.enable_tiff && '--enable-tiff' || '--disable-tiff' }}                      \
           ${{ inputs.inline_projdb && '--enable-inline-projdb' || '--disable-inline-projdb' }}
-        ${EMSDK}/upstream/bin/wasm-opt --enable-bulk-memory --enable-threads --converge -Oz lib/binding/emscripten-wasm32/proj.wasm -o proj.opt.wasm
-        mv proj.opt.wasm lib/binding/emscripten-wasm32/proj.wasm
       if: inputs.wasm
 
     - name: Build the native ASAN version
diff --git a/meson.build b/meson.build
index 5040db0..5b91cb4 100644
--- a/meson.build
+++ b/meson.build
@@ -48,6 +48,8 @@ wasm = meson.get_compiler('cpp').get_id() == 'emscripten'
 if wasm
   add_project_arguments([ '-Wno-documentation' ], language: [ 'cpp', 'c' ])
   add_project_arguments([ '-Wno-potentially-evaluated-expression' ], language: [ 'cpp' ])
+  add_project_arguments([ '-sBINARYEN_EXTRA_PASSES="--enable-bulk-memory,--enable-threads,--converge,-Oz"' ], language: [ 'cpp', 'c' ])
+  add_project_link_arguments([ '-sBINARYEN_EXTRA_PASSES="--enable-bulk-memory,--enable-threads,--converge,-Oz"' ], language: [ 'cpp', 'c' ])
 endif
 
 # Build PROJ and its dependencies