diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index f5a601c3a..7e7c7e615 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -1079,11 +1079,7 @@ RTLIL::Const AstNode::realAsConst(int width)
 {
 	double v = round(realvalue);
 	RTLIL::Const result;
-#ifdef EMSCRIPTEN
-	if (!isfinite(v)) {
-#else
 	if (!std::isfinite(v)) {
-#endif
 		result = std::vector<RTLIL::State>(width, RTLIL::State::Sx);
 	} else {
 		bool is_negative = v < 0;
diff --git a/kernel/driver.cc b/kernel/driver.cc
index 73b687f80..2a4ad1295 100644
--- a/kernel/driver.cc
+++ b/kernel/driver.cc
@@ -70,75 +70,6 @@ namespace py = pybind11;
 
 USING_YOSYS_NAMESPACE
 
-#ifdef EMSCRIPTEN
-#  include <sys/stat.h>
-#  include <sys/types.h>
-#  include <emscripten.h>
-
-extern "C" int main(int, char**);
-extern "C" void run(const char*);
-extern "C" const char *errmsg();
-extern "C" const char *prompt();
-
-int main(int argc, char **argv)
-{
-	EM_ASM(
-		if (ENVIRONMENT_IS_NODE)
-		{
-			FS.mkdir('/hostcwd');
-			FS.mount(NODEFS, { root: '.' }, '/hostcwd');
-			FS.mkdir('/hostfs');
-			FS.mount(NODEFS, { root: '/' }, '/hostfs');
-		}
-	);
-
-	mkdir("/work", 0777);
-	chdir("/work");
-	log_files.push_back(stdout);
-	log_error_stderr = true;
-	yosys_banner();
-	yosys_setup();
-#ifdef YOSYS_ENABLE_PYTHON
-	py::object sys = py::module_::import("sys");
-	sys.attr("path").attr("append")(proc_self_dirname());
-	sys.attr("path").attr("append")(proc_share_dirname());
-#endif
-
-	if (argc == 2)
-	{
-		// Run the first argument as a script file
-		run_frontend(argv[1], "script");
-	}
-}
-
-void run(const char *command)
-{
-	int selSize = GetSize(yosys_get_design()->selection_stack);
-	try {
-		log_last_error = "Internal error (see JavaScript console for details)";
-		run_pass(command);
-		log_last_error = "";
-	} catch (...) {
-		while (GetSize(yosys_get_design()->selection_stack) > selSize)
-			yosys_get_design()->pop_selection();
-		throw;
-	}
-}
-
-const char *errmsg()
-{
-	return log_last_error.c_str();
-}
-
-const char *prompt()
-{
-	const char *p = create_prompt(yosys_get_design(), 0);
-	while (*p == '\n') p++;
-	return p;
-}
-
-#else /* EMSCRIPTEN */
-
 #if defined(YOSYS_ENABLE_READLINE) || defined(YOSYS_ENABLE_EDITLINE)
 int yosys_history_offset = 0;
 std::string yosys_history_file;
@@ -781,5 +712,3 @@ int main(int argc, char **argv)
 
 	return 0;
 }
-
-#endif /* EMSCRIPTEN */
diff --git a/kernel/log.cc b/kernel/log.cc
index 2121143a2..2f5a6350b 100644
--- a/kernel/log.cc
+++ b/kernel/log.cc
@@ -335,9 +335,6 @@ void log_suppressed() {
 [[noreturn]]
 static void log_error_with_prefix(std::string_view prefix, std::string str)
 {
-#ifdef EMSCRIPTEN
-	auto backup_log_files = log_files;
-#endif
 	int bak_log_make_debug = log_make_debug;
 	log_make_debug = 0;
 	log_suppressed();
@@ -378,10 +375,7 @@ static void log_error_with_prefix(std::string_view prefix, std::string str)
 	if (e && atoi(e))
 		abort();
 
-#ifdef EMSCRIPTEN
-	log_files = backup_log_files;
-	throw 0;
-#elif defined(_MSC_VER)
+#if defined(_MSC_VER)
 	_exit(1);
 #else
 	_Exit(1);
@@ -679,9 +673,7 @@ void log_check_expected()
 			log_warn_regexes.clear();
 			log("Expected %s pattern '%s' found !!!\n", kind, pattern);
 			yosys_shutdown();
-			#ifdef EMSCRIPTEN
-				throw 0;
-			#elif defined(_MSC_VER)
+			#if defined(_MSC_VER)
 				_exit(0);
 			#else
 				_Exit(0);
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 1a0da4774..167052340 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -550,7 +550,7 @@ std::string proc_self_dirname()
 		shortpath[--i] = 0;
 	return shortpath;
 }
-#elif defined(EMSCRIPTEN) || defined(__wasm)
+#elif defined(__wasm)
 std::string proc_self_dirname()
 {
 	return "/";
@@ -588,7 +588,7 @@ std::string proc_self_dirname(void)
 	#error "Don't know how to determine process executable base path!"
 #endif
 
-#if defined(EMSCRIPTEN) || defined(__wasm)
+#if defined(__wasm)
 void init_share_dirname()
 {
 	yosys_share_dirname = "/share/";
diff --git a/passes/cmds/exec.cc b/passes/cmds/exec.cc
index ea82ff908..f7a5bf8f7 100644
--- a/passes/cmds/exec.cc
+++ b/passes/cmds/exec.cc
@@ -158,7 +158,6 @@ struct ExecPass : public Pass {
 		int status = 0;
 		int retval = 0;
 
-#ifndef EMSCRIPTEN
 		FILE *f = popen(cmd.c_str(), "r");
 		if (f == nullptr)
 			log_cmd_error("errno %d after popen() returned NULL.\n", errno);
@@ -183,7 +182,6 @@ struct ExecPass : public Pass {
 			}
 		}
 		status = pclose(f);
-#endif
 
 		if(WIFEXITED(status)) {
 		    retval = WEXITSTATUS(status);