diff --git a/tools/ports/freetype.py b/tools/ports/freetype.py
index ac5983709f47f..9390c27219cad 100644
--- a/tools/ports/freetype.py
+++ b/tools/ports/freetype.py
@@ -11,8 +11,8 @@
 HASH = '460ea4dc9cc879822556d801341a1cf3efcd57a13cd4da64169603ea98873337dd19e3c8c6d9054b27d10acbbaa8d5c59b7f560c697b98dc2640bcd88f57554a'
 
 variants = {
-  'freetype-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 0},
-  'freetype-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},
+  'freetype-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': False},
+  'freetype-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': True},
 }
 deps = ['zlib']
 
@@ -103,7 +103,7 @@ def create(final):
 
     if settings.SUPPORT_LONGJMP == 'wasm':
       flags.append('-sSUPPORT_LONGJMP=wasm')
-      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={settings.WASM_LEGACY_EXCEPTIONS}')
+      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={int(settings.WASM_LEGACY_EXCEPTIONS)}')
 
     ports.make_pkg_config('freetype2', PKG_VERSION, '-sUSE_FREETYPE')
     ports.build_port(source_path, final, 'freetype', flags=flags, srcs=srcs)
diff --git a/tools/ports/libpng.py b/tools/ports/libpng.py
index f603390ec2fb3..911764866589e 100644
--- a/tools/ports/libpng.py
+++ b/tools/ports/libpng.py
@@ -13,10 +13,10 @@
 deps = ['zlib']
 variants = {
   'libpng-mt': {'PTHREADS': 1},
-  'libpng-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 0},
-  'libpng-mt-wasmsjlj': {'PTHREADS': 1, 'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 0},
-  'libpng-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},
-  'libpng-mt-legacysjlj': {'PTHREADS': 1, 'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},
+  'libpng-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': False},
+  'libpng-mt-wasmsjlj': {'PTHREADS': 1, 'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': False},
+  'libpng-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': True},
+  'libpng-mt-legacysjlj': {'PTHREADS': 1, 'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': True},
 }
 
 
@@ -51,7 +51,7 @@ def create(final):
       flags += ['-pthread']
     if settings.SUPPORT_LONGJMP == 'wasm':
       flags.append('-sSUPPORT_LONGJMP=wasm')
-      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={settings.WASM_LEGACY_EXCEPTIONS}')
+      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={int(settings.WASM_LEGACY_EXCEPTIONS)}')
 
     ports.build_port(source_path, final, 'libpng', flags=flags, exclude_files=['pngtest'], exclude_dirs=['scripts', 'contrib'])
 
diff --git a/tools/ports/sdl2_image.py b/tools/ports/sdl2_image.py
index b0699dfcfc395..82b5d9eef6c9e 100644
--- a/tools/ports/sdl2_image.py
+++ b/tools/ports/sdl2_image.py
@@ -8,8 +8,8 @@
 
 deps = ['sdl2']
 variants = {
-  'sdl2_image-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 0},
-  'sdl2_image-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': 1},
+  'sdl2_image-wasmsjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': False},
+  'sdl2_image-legacysjlj': {'SUPPORT_LONGJMP': 'wasm', 'WASM_LEGACY_EXCEPTIONS': True},
   'sdl2_image-jpg':    {'SDL2_IMAGE_FORMATS': ["jpg"]},
   'sdl2_image-png':    {'SDL2_IMAGE_FORMATS': ["png"]},
   'sdl2_image-jpg-mt': {'SDL2_IMAGE_FORMATS': ["jpg"], 'PTHREADS': 1},
@@ -81,7 +81,7 @@ def create(final):
 
     if settings.SUPPORT_LONGJMP == 'wasm':
       flags.append('-sSUPPORT_LONGJMP=wasm')
-      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={settings.WASM_LEGACY_EXCEPTIONS}')
+      flags.append(f'-sWASM_LEGACY_EXCEPTIONS={int(settings.WASM_LEGACY_EXCEPTIONS)}')
 
     ports.build_port(src_dir, final, 'sdl2_image', flags=flags, srcs=srcs)