--- a/lib/kcapi-rng.c
+++ b/lib/kcapi-rng.c
@@ -181,7 +181,7 @@ static int get_random(uint8_t *buf, size
 }
 
 /* For efficiency reasons, this should be identical to algif_rng.c:MAXSIZE. */
-#define KCAPI_RNG_BUFSIZE  128
+#define KCAPI_RNG_BUFSIZE  256
 /* Minimum seed is 256 bits. */
 #define KCAPI_RNG_MINSEEDSIZE 32
 #define KCAPI_APP_ALIGN 8