diff --git a/include/global.h b/include/global.h
index 8f7ed95a4..b3f17e996 100644
--- a/include/global.h
+++ b/include/global.h
@@ -325,15 +325,15 @@ struct version_info {
     unsigned long incarnation;   /* actual version number */
     unsigned long feature_set;   /* bitmask of config settings */
     unsigned long entity_count;  /* # of monsters and objects */
-#ifndef WASM
+#ifndef __EMSCRIPTEN__
     unsigned long struct_sizes1; /* size of key structs */
     unsigned long struct_sizes2; /* size of more key structs */
-#else /* WASM */
+#else /* __EMSCRIPTEN__ */
     /* 'long' in WASM is 4 bytes, which is too small to hold version numbers
      * such as: VERSION_SANITY2 */
     unsigned long long struct_sizes1; /* size of key structs */
     unsigned long long struct_sizes2; /* size of more key structs */
-#endif /* !WASM */
+#endif /* !__EMSCRIPTEN__ */
 };
 
 struct savefile_info {
@@ -397,7 +397,7 @@ struct savefile_info {
 
 /* PANICTRACE: Always defined for NH_DEVEL_STATUS != NH_STATUS_RELEASED
    but only for supported platforms. */
-#if defined(UNIX) && !defined(WASM)
+#if defined(UNIX) && !defined(__EMSCRIPTEN__)
 #if (NH_DEVEL_STATUS != NH_STATUS_RELEASED)
 /* see end.c */
 #ifndef PANICTRACE
@@ -412,7 +412,7 @@ struct savefile_info {
 #if defined(MACOSX)
 #define PANICTRACE_LIBC
 #endif
-#if defined(UNIX) && !defined(WASM) /* no popen in WASM */
+#if defined(UNIX) && !defined(__EMSCRIPTEN__) /* no popen in WASM */
 #define PANICTRACE_GDB
 #endif
 
diff --git a/sys/lib/Makefile.utl b/sys/lib/Makefile.utl
index ce39a3edf..cd1cca159 100644
--- a/sys/lib/Makefile.utl
+++ b/sys/lib/Makefile.utl
@@ -148,9 +148,6 @@ CXX_V1 = @echo "[CXX] $<"; $(ACTUAL_CXX)
 CXX = $(CXX_V$(QUIETCC))
 
 CFLAGS+=-I../include
-ifdef WANT_WASM
-CFLAGS+=-DWASM
-endif
 
 # LD and LINK might be based on invoking CC and may not be able to substitute
 # for QUIETCC, so feedback from them is handled differently (via $AT)
diff --git a/sys/lib/hints/wasm b/sys/lib/hints/wasm
index e5cf4bc7b..8715104c8 100644
--- a/sys/lib/hints/wasm
+++ b/sys/lib/hints/wasm
@@ -17,7 +17,7 @@ EMCC_LFLAGS=-s WASM=1
 EMCC_LFLAGS+=-s ALLOW_TABLE_GROWTH
 EMCC_LFLAGS+=-s ASYNCIFY -s ASYNCIFY_IMPORTS='["_nhmain"]' -O3
 EMCC_LFLAGS+=-s MODULARIZE
-EMCC_LFLAGS+=-s EXPORTED_FUNCTIONS='["_main"]'
+EMCC_LFLAGS+=-s EXPORTED_FUNCTIONS='["_main", "_stub_graphics_set_callback"]'
 EMCC_LFLAGS+=-s EXPORTED_RUNTIME_METHODS='["cwrap", "ccall", "addFunction", "removeFunction", "UTF8ToString"]'
 EMCC_LFLAGS+=-s ERROR_ON_UNDEFINED_SYMBOLS=0
 EMCC_LFLAGS+=--embed-file wasm-data@/
@@ -25,7 +25,6 @@ EMCC_LFLAGS+=--embed-file wasm-data@/
 # WASM C flags
 EMCC_CFLAGS=
 EMCC_CFLAGS+=-Wall -Werror
-EMCC_CFLAGS+=-DWASM
 EMCC_DEBUG_CFLAGS+=-s ASSERTIONS=1
 EMCC_DEBUG_CFLAGS+=-s STACK_OVERFLOW_CHECK=2
 EMCC_DEBUG_CFLAGS+=-s SAFE_HEAP=1
diff --git a/util/makedefs.c b/util/makedefs.c
index 7ff0ec2c9..68421776f 100644
--- a/util/makedefs.c
+++ b/util/makedefs.c
@@ -1218,17 +1218,17 @@ do_date()
 #endif
     Fprintf(ofp, "#define VERSION_SANITY1 0x%08lx%s\n", version.entity_count,
             ul_sfx);
-#ifndef WASM
+#ifndef __EMSCRIPTEN__
     Fprintf(ofp, "#define VERSION_SANITY2 0x%08lx%s\n", version.struct_sizes1,
             ul_sfx);
     Fprintf(ofp, "#define VERSION_SANITY3 0x%08lx%s\n", version.struct_sizes2,
             ul_sfx);
-#else /* WASM */
+#else /* __EMSCRIPTEN__ */
     Fprintf(ofp, "#define VERSION_SANITY2 0x%08llx%s\n", version.struct_sizes1,
             ul_sfx);
     Fprintf(ofp, "#define VERSION_SANITY3 0x%08llx%s\n", version.struct_sizes2,
             ul_sfx);
-#endif /* !WASM */
+#endif /* !__EMSCRIPTEN__ */
 
     Fprintf(ofp, "\n");
     Fprintf(ofp, "#define VERSION_STRING \"%s\"\n", version_string(buf, "."));