diff --git a/frontends/verilog/const2ast.cc b/frontends/verilog/const2ast.cc
index 7093b97ee..450a3ea1b 100644
--- a/frontends/verilog/const2ast.cc
+++ b/frontends/verilog/const2ast.cc
@@ -36,6 +36,7 @@
 
 #include "verilog_frontend.h"
 #include "kernel/log.h"
+#include "kernel/register.h"
 #include <string.h>
 #include <math.h>
 
@@ -47,6 +48,9 @@ using namespace VERILOG_FRONTEND;
 void ConstParser::log_maybe_loc_error(std::string msg) {
 	if (loc.begin.filename)
 		log_file_error(*loc.begin.filename, loc.begin.line, "%s", msg);
+	else if (!Frontend::current_script_filename.empty())
+		log_file_error(Frontend::current_script_filename, Frontend::current_script_lineno,
+			"Failed to parse constant `%s': %s", code_str, msg);
 	else
 		log_error("Failed to parse constant `%s': %s", code_str, msg);
 }
@@ -54,6 +58,9 @@ void ConstParser::log_maybe_loc_error(std::string msg) {
 void ConstParser::log_maybe_loc_warn(std::string msg) {
 	if (loc.begin.filename)
 		log_file_warning(*loc.begin.filename, loc.begin.line, "%s", msg);
+	else if (!Frontend::current_script_filename.empty())
+		log_file_warning(Frontend::current_script_filename, Frontend::current_script_lineno,
+			"While parsing constant `%s': %s", code_str, msg);
 	else
 		log_warning("While parsing constant `%s': %s", code_str, msg);
 }
diff --git a/kernel/register.cc b/kernel/register.cc
index db42de008..d3bfd42ad 100644
--- a/kernel/register.cc
+++ b/kernel/register.cc
@@ -459,6 +459,8 @@ void Frontend::execute(std::vector<std::string> args, RTLIL::Design *design)
 
 FILE *Frontend::current_script_file = NULL;
 std::string Frontend::last_here_document;
+std::string Frontend::current_script_filename;
+int Frontend::current_script_lineno = 0;
 
 void Frontend::extra_args(std::istream *&f, std::string &filename, std::vector<std::string> args, size_t argidx, bool bin_input)
 {
@@ -496,6 +498,7 @@ void Frontend::extra_args(std::istream *&f, std::string &filename, std::vector<s
 					if (buffer.size() > 0 && (buffer[buffer.size() - 1] == '\n' || buffer[buffer.size() - 1] == '\r'))
 						break;
 				}
+				Frontend::current_script_lineno++;
 				size_t indent = buffer.find_first_not_of(" \t\r\n");
 				if (indent != std::string::npos && buffer.compare(indent, eot_marker.size(), eot_marker) == 0)
 					break;
diff --git a/kernel/register.h b/kernel/register.h
index ae3df395a..4b8da06b1 100644
--- a/kernel/register.h
+++ b/kernel/register.h
@@ -150,6 +150,10 @@ struct Frontend : Pass
 	static FILE *current_script_file;
 	static std::string last_here_document;
 
+	// script file and last line read from it
+	static std::string current_script_filename;
+	static int current_script_lineno;
+
 	std::string frontend_name;
 	Frontend(std::string name, std::string short_help = "** document me **",
 		source_location location = source_location::current());
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 167052340..d47610800 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -792,15 +792,21 @@ bool run_frontend(std::string filename, std::string command, RTLIL::Design *desi
 			log_error("Can't open script file `%s' for reading: %s\n", filename, strerror(errno));
 
 		FILE *backup_script_file = Frontend::current_script_file;
+		std::string backup_script_filename = Frontend::current_script_filename;
+		int backup_script_lineno = Frontend::current_script_lineno;
 		Frontend::current_script_file = f;
+		Frontend::current_script_filename = filename;
+		Frontend::current_script_lineno = 0;
 
 		try {
 			std::string command;
 			while (fgetline(f, command)) {
+				Frontend::current_script_lineno++;
 				while (!command.empty() && command[command.size()-1] == '\\') {
 					std::string next_line;
 					if (!fgetline(f, next_line))
 						break;
+					Frontend::current_script_lineno++;
 					command.resize(command.size()-1);
 					command += next_line;
 				}
@@ -814,6 +820,7 @@ bool run_frontend(std::string filename, std::string command, RTLIL::Design *desi
 			if (!command.empty()) {
 				handle_label(command, from_to_active, run_from, run_to);
 				if (from_to_active) {
+					Frontend::current_script_lineno++;
 					Pass::call(design, command);
 					design->check();
 				}
@@ -821,10 +828,14 @@ bool run_frontend(std::string filename, std::string command, RTLIL::Design *desi
 		}
 		catch (...) {
 			Frontend::current_script_file = backup_script_file;
+			Frontend::current_script_filename = backup_script_filename;
+			Frontend::current_script_lineno = backup_script_lineno;
 			throw;
 		}
 
 		Frontend::current_script_file = backup_script_file;
+		Frontend::current_script_filename = backup_script_filename;
+		Frontend::current_script_lineno = backup_script_lineno;
 
 		if (filename != "-")
 			fclose(f);
diff --git a/tests/various/const_cmdline.ys b/tests/various/const_cmdline.ys
index 5874c2ecf..b620d9a50 100644
--- a/tests/various/const_cmdline.ys
+++ b/tests/various/const_cmdline.ys
@@ -7,9 +7,9 @@ EOT
 prep -top top
 
 # width mismatch
-logger -expect warning "While parsing constant `2'd7'" 1
+logger -expect prefix-warning "const_cmdline.ys:[0-9]+: Warning: While parsing constant `2'd7'" 1
 setattr -set foo 2'd7 t:*
 
 # multi-bit unsized const
-logger -expect error "Failed to parse constant `8'00000101'" 1
+logger -expect prefix-error "const_cmdline.ys:[0-9]+: ERROR: Failed to parse constant `8'00000101'" 1
 setattr -set foo 8'00000101 t:*