diff --git a/.github/workflows/emscripten.yml b/.github/workflows/emscripten.yml
index 519eed7..fbfdf37 100644
--- a/.github/workflows/emscripten.yml
+++ b/.github/workflows/emscripten.yml
@@ -2,7 +2,7 @@ name: Emscripten Build
 on: [push, pull_request]
 
 env:
-  EM_VERSION: 3.1.32
+  EM_VERSION: 3.1.34
   EM_CACHE_FOLDER: 'emsdk-cache'
 
 jobs:
diff --git a/src/texthook.cpp b/src/texthook.cpp
index 5c3603f..e446f0f 100644
--- a/src/texthook.cpp
+++ b/src/texthook.cpp
@@ -9,17 +9,17 @@ void texthook_character(int page, int character) {
 			character, page);
 }
 
-void texthook_newline() {
-	EM_ASM(xsystem35.texthook.newline());
-}
+EM_JS(void, texthook_newline, (void), {
+	xsystem35.texthook.newline();
+});
 
-void texthook_nextpage() {
-	EM_ASM(xsystem35.texthook.nextpage());
-}
+EM_JS(void, texthook_nextpage, (void), {
+	xsystem35.texthook.nextpage();
+});
 
-void texthook_keywait(void) {
-	EM_ASM(xsystem35.texthook.keywait());
-}
+EM_JS(void, texthook_keywait, (void), {
+	xsystem35.texthook.keywait();
+});
 
 #elif defined(TEXTHOOK_PRINT)  // --------------------------------------
 
diff --git a/src/texthook.h b/src/texthook.h
index 4df418d..aba722f 100644
--- a/src/texthook.h
+++ b/src/texthook.h
@@ -1,9 +1,13 @@
 #ifndef _TEXTHOOK_H_
 #define _TEXTHOOK_H_
 
+extern "C" {
+
 void texthook_character(int page, int character);
-void texthook_newline();
-void texthook_nextpage();
-void texthook_keywait();
+void texthook_newline(void);
+void texthook_nextpage(void);
+void texthook_keywait(void);
+
+}
 
 #endif /* _TEXTHOOK_H_ */