diff --git a/configure.ac b/configure.ac
index ae1320b..c711ca8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -115,7 +115,7 @@ AS_IF([test "x$with_libpng" != xno], [
 
 # TODO: We currently link everything against libraries that don't need it.
 # Use the specific library CFLAGS/LIBS variables instead of setting them here.
-EMFLAGS="-gsource-map -s INVOKE_RUN=1 -s USE_SDL=2 -s USE_SDL_MIXER=2 -s LEGACY_GL_EMULATION=0 -s USE_SDL_NET=2 -s ASSERTIONS=0 -s WASM=1 -s ALLOW_MEMORY_GROWTH=0 -s FORCE_FILESYSTEM=1 -s EXTRA_EXPORTED_RUNTIME_METHODS=[['FS','ccall']] -s SAFE_HEAP=1 -s EXIT_RUNTIME=1 -s STACK_OVERFLOW_CHECK=1 -s PROXY_POSIX_SOCKETS=0 -s USE_PTHREADS=0 -s PROXY_TO_PTHREAD=0 -s TOTAL_MEMORY=64MB -s ERROR_ON_UNDEFINED_SYMBOLS=0 -s ASYNCIFY -O3 --source-map-base /"
+EMFLAGS="-gsource-map -s INVOKE_RUN=1 -s USE_SDL=2 -s USE_SDL_MIXER=2 -s LEGACY_GL_EMULATION=0 -s USE_SDL_NET=2 -s ASSERTIONS=0 -s WASM=1 -s ALLOW_MEMORY_GROWTH=0 -s FORCE_FILESYSTEM=1 -s EXPORTED_RUNTIME_METHODS=['FS','ccall','callMain'] -s EXIT_RUNTIME=1 -s PROXY_POSIX_SOCKETS=0 -s USE_PTHREADS=0 -s PROXY_TO_PTHREAD=0 -s TOTAL_MEMORY=64MB -s ERROR_ON_UNDEFINED_SYMBOLS=0 -s ASYNCIFY -s STACK_SIZE=5MB -O3 -fno-strict-aliasing --source-map-base /"
 
 CFLAGS="$CFLAGS $SDL_CFLAGS ${SAMPLERATE_CFLAGS:-} ${PNG_CFLAGS:-} $EMFLAGS"
 LDFLAGS="$LDFLAGS $SDL_LIBS ${SAMPLERATE_LIBS:-} ${PNG_LIBS:-} $EMFLAGS -lwebsocket.js"
diff --git a/src/doomtype.h b/src/doomtype.h
index 9947a07..7a780ce 100644
--- a/src/doomtype.h
+++ b/src/doomtype.h
@@ -100,7 +100,7 @@
 
 #include <inttypes.h>
 
-#if defined(__cplusplus) || defined(__bool_true_false_are_defined)
+#if defined(__cplusplus)
 
 // Use builtin bool type with C++.
 
@@ -108,11 +108,16 @@ typedef bool boolean;
 
 #else
 
-typedef enum 
-{
-    false, 
-    true
-} boolean;
+// Always int-sized in C. Emscripten's headers pull in stdbool.h in some files only, and a 1-byte boolean
+// there against a 4-byte one elsewhere corrupts shared globals (netgame, playeringame[], view state).
+// Doom also memsets booleans to -1 as a marker, which needs more than one byte.
+
+typedef int boolean;
+
+#if !defined(__bool_true_false_are_defined) && !(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
+#define false 0
+#define true 1
+#endif
 
 #endif