diff --git a/src/util-strings.h b/src/util-strings.h
index 47306b8..c045e1d 100644
--- a/src/util-strings.h
+++ b/src/util-strings.h
@@ -390,31 +390,3 @@ safe_basename(const char *filename);
 
 char *
 trunkname(const char *filename);
-
-/**
- * Return a copy of str with all % converted to %% to make the string
- * acceptable as printf format.
- */
-static inline char *
-str_sanitize(const char *str)
-{
-	if (!str)
-		return NULL;
-
-	if (!strchr(str, '%'))
-		return strdup(str);
-
-	size_t slen = min(strlen(str), 512);
-	char *sanitized = zalloc(2 * slen + 1);
-	const char *src = str;
-	char *dst = sanitized;
-
-	for (size_t i = 0; i < slen; i++) {
-		if (*src == '%')
-			*dst++ = '%';
-		*dst++ = *src++;
-	}
-	*dst = '\0';
-
-	return sanitized;
-}