diff --git a/src/utils/wpa_debug.c b/src/utils/wpa_debug.c
index 7846c1e..647f6b4 100644
--- a/src/utils/wpa_debug.c
+++ b/src/utils/wpa_debug.c
@@ -596,10 +596,14 @@
 {
 	va_list ap;
 	char *buf;
-	const int buflen = 2048;
+	int buflen;
 	int len;
 	char prefix[130];
 
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
 	buf = os_malloc(buflen);
 	if (buf == NULL) {
 		wpa_printf(MSG_ERROR, "wpa_msg: Failed to allocate message "
@@ -630,12 +634,16 @@
 {
 	va_list ap;
 	char *buf;
-	const int buflen = 2048;
+	int buflen;
 	int len;
 
 	if (!wpa_msg_cb)
 		return;
 
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
 	buf = os_malloc(buflen);
 	if (buf == NULL) {
 		wpa_printf(MSG_ERROR, "wpa_msg_ctrl: Failed to allocate "
@@ -654,9 +662,13 @@
 {
 	va_list ap;
 	char *buf;
-	const int buflen = 2048;
+	int buflen;
 	int len;
 
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
 	buf = os_malloc(buflen);
 	if (buf == NULL) {
 		wpa_printf(MSG_ERROR, "wpa_msg_global: Failed to allocate "
@@ -677,9 +689,13 @@
 {
 	va_list ap;
 	char *buf;
-	const int buflen = 2048;
+	int buflen;
 	int len;
 
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
 	buf = os_malloc(buflen);
 	if (buf == NULL) {
 		wpa_printf(MSG_ERROR, "wpa_msg_no_global: Failed to allocate "
@@ -712,9 +728,13 @@
 {
 	va_list ap;
 	char *buf;
-	const int buflen = 2048;
+	int buflen;
 	int len;
 
+	va_start(ap, fmt);
+	buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
+	va_end(ap);
+
 	buf = os_malloc(buflen);
 	if (buf == NULL) {
 		wpa_printf(MSG_ERROR, "hostapd_logger: Failed to allocate "