diff --git a/frontends/rtlil/rtlil_parser.y b/frontends/rtlil/rtlil_parser.y
index 2b8d7b7ab..0f286377b 100644
--- a/frontends/rtlil/rtlil_parser.y
+++ b/frontends/rtlil/rtlil_parser.y
@@ -187,7 +187,11 @@ wire_stmt:
 
 wire_options:
 	wire_options TOK_WIDTH TOK_INT {
-		current_wire->width = $3;
+		if ($3 > 0x1000000) {
+			rtlil_frontend_yyerror("RTLIL error: invalid wire width, must be less than 2^24");
+		} else {
+			current_wire->width = $3;
+		}
 	} |
 	wire_options TOK_WIDTH TOK_INVALID {
 		rtlil_frontend_yyerror("RTLIL error: invalid wire width");
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index 8daf2c821..0b91f8257 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -266,6 +266,9 @@ std::string& Const::get_str() {
 
 RTLIL::Const::Const(const std::string &str)
 {
+	if (str.size() * 8 > 0x1000000)
+		log_error("RTLIL Const width must be less than 2^24");
+
 	flags = RTLIL::CONST_FLAG_STRING;
 	new ((void*)&str_) std::string(str);
 	tag = backing_tag::string;
@@ -273,6 +276,12 @@ RTLIL::Const::Const(const std::string &str)
 
 RTLIL::Const::Const(long long val) // default width 32
 {
+	if (width < 0)
+		log_error("RTLIL Const width must not be negative");
+
+	if (width > 0x1000000)
+		log_error("RTLIL Const width must be less than 2^24");
+
 	flags = RTLIL::CONST_FLAG_NONE;
 	char bytes[] = {
 		(char)(val >> 24), (char)(val >> 16), (char)(val >> 8), (char)val
@@ -311,6 +320,12 @@ RTLIL::Const::Const(long long val, int width)
 
 RTLIL::Const::Const(RTLIL::State bit, int width)
 {
+	if (width < 0)
+		log_error("RTLIL Const width must not be negative");
+
+	if (width > 0x1000000)
+		log_error("RTLIL Const width must be less than 2^24");
+
 	flags = RTLIL::CONST_FLAG_NONE;
 	new ((void*)&bits_) bitvectype();
 	tag = backing_tag::bits;
@@ -322,6 +337,10 @@ RTLIL::Const::Const(RTLIL::State bit, int width)
 
 RTLIL::Const::Const(const std::vector<bool> &bits)
 {
+
+	if (bits.size() > 0x1000000)
+		log_error("RTLIL Const width must be less than 2^24");
+
 	flags = RTLIL::CONST_FLAG_NONE;
 	new ((void*)&bits_) bitvectype();
 	tag = backing_tag::bits;
@@ -573,6 +592,10 @@ std::string RTLIL::Const::as_string(const char* any) const
 
 RTLIL::Const RTLIL::Const::from_string(const std::string &str)
 {
+
+	if (str.size() > 0x1000000)
+		log_error("RTLIL width must be less than 2^24");
+
 	Const c;
 	bitvectype& bv = c.get_bits();
 	bv.reserve(str.size());