diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index c6abef32..5719c8cb 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -2497,7 +2497,6 @@ static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
 
     ZSTD_Sequence* outSeqs = &zc->seqCollector.seqStart[zc->seqCollector.seqIndex];
     size_t i;
-    int repIdx;
     U32 rep[ZSTD_REP_NUM];
     U32 shouldUpdateRep;
 
@@ -2561,8 +2560,9 @@ static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
         }
         outSeqs[i].offset = rawOffset;
         if (shouldUpdateRep) {
-            for (int i = ZSTD_REP_NUM - 1; i > 0; i--) {
-                rep[i] = rep[i - 1];
+            int j;
+            for (j = ZSTD_REP_NUM - 1; j > 0; j--) {
+                rep[j] = rep[j - 1];
             }
             rep[0] = outSeqs[i].offset;
         }
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 65e44209..3a3fb6a1 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -2723,7 +2723,7 @@ static int basicUnitTests(U32 const seed, double compressibility)
         assert(cctx != NULL);
 
         /* Populate src with random data */
-        RDG_genBuffer(CNBuffer, srcSize, compressibility, 0., seed);
+        RDG_genBuffer(CNBuffer, srcSize, compressibility, 0.5, seed);
 
         /* Test with block delimiters roundtrip */
         seqsSize = ZSTD_generateSequences(cctx, seqs, srcSize, src, srcSize);