diff --git a/include/proto/spoe.h b/include/proto/spoe.h
index 1372a7d..002cf7d 100644
--- a/include/proto/spoe.h
+++ b/include/proto/spoe.h
@@ -92,7 +92,7 @@
  * On success, it returns the buffer length and <*buf> is moved after the
  * encoded buffer. Otherwise, it returns -1. */
 static inline int
-spoe_decode_buffer(char **buf, char *end, char **str, size_t *len)
+spoe_decode_buffer(char **buf, char *end, char **str, uint64_t *len)
 {
 	char    *p = *buf;
 	uint64_t sz;
@@ -248,8 +248,7 @@
 {
 	char    *str, *p = *buf;
 	int      type, ret;
-	size_t   sz;
-	uint64_t v;
+	uint64_t v, sz;
 
 	if (p >= end)
 		return -1;
@@ -296,7 +295,7 @@
 {
 	char  *str, *p = *buf;
 	int    type, r = 0;
-	size_t sz;
+	uint64_t sz;
 
 	if (p >= end)
 		return -1;
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 5d57447..1a8bd2c 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -655,7 +655,7 @@
 	vsn = max_frame_size = flags = 0;
 	while (p < end) {
 		char  *str;
-		size_t sz;
+		uint64_t sz;
 		int    ret;
 
 		/* Decode the item key */
@@ -836,7 +836,7 @@
 	/* Loop on K/V items */
 	while (p < end) {
 		char  *str;
-		size_t sz;
+		uint64_t sz;
 		int    ret;
 
 		/* Decode the item key */