diff --git a/src/util-strings.h b/src/util-strings.h
index 90d62f0..f960c86 100644
--- a/src/util-strings.h
+++ b/src/util-strings.h
@@ -274,64 +274,3 @@ out:
 	free(numv);
 	return result;
 }
-
-struct key_value_str{
-	char *key;
-	char *value;
-};
-
-struct key_value_double {
-	double key;
-	double value;
-};
-
-static inline ssize_t
-kv_double_from_string(const char *string,
-		      const char *pair_separator,
-		      const char *kv_separator,
-		      struct key_value_double **result_out)
-
-{
-	struct key_value_double *result = NULL;
-
-	if (!pair_separator || pair_separator[0] == '\0' ||
-	    !kv_separator || kv_separator[0] == '\0')
-		return -1;
-
-	size_t npairs;
-	char **pairs = strv_from_string(string, pair_separator, &npairs);
-	if (!pairs || npairs == 0)
-		goto error;
-
-	result = zalloc(npairs * sizeof *result);
-
-	for (size_t idx = 0; idx < npairs; idx++) {
-		char *pair = pairs[idx];
-		size_t nelem;
-		char **kv = strv_from_string(pair, kv_separator, &nelem);
-		double k, v;
-
-		if (!kv || nelem != 2 ||
-		    !safe_atod(kv[0], &k) ||
-		    !safe_atod(kv[1], &v)) {
-			strv_free(kv);
-			goto error;
-		}
-
-		result[idx].key = k;
-		result[idx].value = v;
-
-		strv_free(kv);
-	}
-
-	strv_free(pairs);
-
-	*result_out = result;
-
-	return npairs;
-
-error:
-	strv_free(pairs);
-	free(result);
-	return -1;
-}