diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 1e204d06..f31ba5e0 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -2722,7 +2722,7 @@ static int basicUnitTests(U32 const seed, double compressibility)
         assert(cctx != NULL);
 
         /* Populate src with random data */
-        RDG_genBuffer(CNBuffer, srcSize, 0.03, 0., seed);
+        RDG_genBuffer(CNBuffer, srcSize, compressibility, 0., seed);
 
         /* Test with block delimiters roundtrip */
         seqsSize = ZSTD_getSequences(cctx, seqs, srcSize, src, srcSize, ZSTD_sf_explicitBlockDelimiters);