diff --git a/src/chars.c b/src/chars.c
index 23fbba49..06369e64 100644
--- a/src/chars.c
+++ b/src/chars.c
@@ -44,18 +44,6 @@ bool using_utf8(void)
 }
 #endif /* ENABLE_UTF8 */
 
-/* Concatenate two allocated strings, and free the second. */
-char *addstrings(char* str1, size_t len1, char* str2, size_t len2)
-{
-	str1 = charealloc(str1, len1 + len2 + 1);
-	str1[len1] = '\0';
-
-	strncat(&str1[len1], str2, len2);
-	free(str2);
-
-	return str1;
-}
-
 /* This function is equivalent to isalpha() for multibyte characters. */
 bool is_alpha_mbchar(const char *c)
 {
diff --git a/src/proto.h b/src/proto.h
index c4204d56..0dc94af7 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -203,7 +203,6 @@ char *strip_last_component(const char *path);
 void utf8_init(void);
 bool using_utf8(void);
 #endif
-char *addstrings(char* str1, size_t len1, char* str2, size_t len2);
 bool is_alpha_mbchar(const char *c);
 bool is_blank_mbchar(const char *c);
 bool is_cntrl_mbchar(const char *c);