diff --git a/util/include/rusefi/efistring.h b/util/include/rusefi/efistring.h
new file mode 100644
index 0000000..7fcb397
--- /dev/null
+++ b/util/include/rusefi/efistring.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <cstddef>
+
+char *strlncpy(char *dest, const char *src, size_t size);
diff --git a/util/src/efistring.cpp b/util/src/efistring.cpp
new file mode 100644
index 0000000..8da178d
--- /dev/null
+++ b/util/src/efistring.cpp
@@ -0,0 +1,17 @@
+#include <rusefi/efistring.h>
+
+// see strncpy man page
+// this implementation helps avoiding following gcc error/warning:
+// error: 'strncpy' output may be truncated copying xxx bytes from a string of length xxx
+
+char *strlncpy(char *dest, const char *src, size_t size)
+{
+	size_t i;
+
+	for (i = 0; (i < (size - 1)) && (src[i] != '\0'); i++)
+		dest[i] = src[i];
+	for ( ; i < size; i++)
+		dest[i] = '\0';
+
+	return dest;
+}
diff --git a/util/util.mk b/util/util.mk
index f4188de..003381b 100644
--- a/util/util.mk
+++ b/util/util.mk
@@ -3,6 +3,7 @@ RUSEFI_LIB_INC += $(RUSEFI_LIB)/util/include $(RUSEFI_LIB)/util/include/rusefi/c
 RUSEFI_LIB_CPP += \
 	$(RUSEFI_LIB)/util/src/util_dummy.cpp \
 	$(RUSEFI_LIB)/util/src/crc.cpp \
+	$(RUSEFI_LIB)/util/src/efistring.cpp \
 	$(RUSEFI_LIB)/util/src/efistringutil.cpp \
 	$(RUSEFI_LIB)/util/src/fragments.cpp \
 	$(RUSEFI_LIB)/util/src/rusefi_math.cpp \