diff --git a/programs/fileio.c b/programs/fileio.c
index 05695824..598848d3 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -480,8 +480,6 @@ typedef struct {
     size_t srcBufferSize;
     void*  dstBuffer;
     size_t dstBufferSize;
-    void*  dictBuffer;
-    size_t dictBufferSize;
     ZSTD_DStream* dctx;
     FILE*  dstFile;
 } dRess_t;
@@ -501,7 +499,12 @@ static dRess_t FIO_createDResources(const char* dictFileName)
     if (!ress.srcBuffer || !ress.dstBuffer) EXM_THROW(61, "Allocation error : not enough memory");
 
     /* dictionary */
-    ress.dictBufferSize = FIO_loadFile(&(ress.dictBuffer), dictFileName);
+    {   void* dictBuffer;
+        size_t const dictBufferSize = FIO_loadFile(&dictBuffer, dictFileName);
+        size_t const initError = ZSTD_initDStream_usingDict(ress.dctx, dictBuffer, dictBufferSize);
+        if (ZSTD_isError(initError)) EXM_THROW(61, "ZSTD_initDStream_usingDict error : %s", ZSTD_getErrorName(initError));
+        free(dictBuffer);
+    }
 
     return ress;
 }
@@ -512,7 +515,6 @@ static void FIO_freeDResources(dRess_t ress)
     if (ZSTD_isError(errorCode)) EXM_THROW(69, "Error : can't free ZSTD_DStream context resource : %s", ZSTD_getErrorName(errorCode));
     free(ress.srcBuffer);
     free(ress.dstBuffer);
-    free(ress.dictBuffer);
 }
 
 
@@ -601,7 +603,7 @@ unsigned long long FIO_decompressFrame(dRess_t ress,
     size_t readSize;
     U32 storedSkips = 0;
 
-    ZSTD_initDStream_usingDict(ress.dctx, ress.dictBuffer, ress.dictBufferSize);
+    ZSTD_resetDStream(ress.dctx);
 
     /* Header loading (optional, saves one loop) */
     {   size_t const toLoad = 9 - alreadyLoaded;   /* assumption : 9 >= alreadyLoaded */
diff --git a/tests/playTests.sh b/tests/playTests.sh
index 21e98bf9..042197c2 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -205,7 +205,7 @@ $MD5SUM dirTestDict/* > tmph1
 $ZSTD -f --rm dirTestDict/* -D tmpDictC
 $ZSTD -d --rm dirTestDict/*.zst -D tmpDictC  # note : use internal checksum by default
 if [[ "$OSTYPE" == "darwin"* ]]; then
-  $ECHO "test skipped on OS-X"  # not compatible with OS-X's md5
+  $ECHO "md5sum -c not supported on OS-X : test skipped"  # not compatible with OS-X's md5
 else
   $MD5SUM -c tmph1
 fi
diff --git a/tests/zstreamtest.c b/tests/zstreamtest.c
index 97fbaa18..d10d4f12 100644
--- a/tests/zstreamtest.c
+++ b/tests/zstreamtest.c
@@ -209,7 +209,8 @@ static int basicUnitTests(U32 seed, double compressibility, ZSTD_customMem custo
 
     /* Byte-by-byte decompression test */
     DISPLAYLEVEL(4, "test%3i : decompress byte-by-byte : ", testNb++);
-    {   size_t r = 1;
+    {   /* skippable frame */
+        size_t r = 1;
         ZSTD_initDStream_usingDict(zd, CNBuffer, 128 KB);
         inBuff.src = compressedBuffer;
         outBuff.dst = decodedBuffer;
@@ -221,9 +222,10 @@ static int basicUnitTests(U32 seed, double compressibility, ZSTD_customMem custo
             r = ZSTD_decompressStream(zd, &outBuff, &inBuff);
             if (ZSTD_isError(r)) goto _output_error;
         }
+        /* normal frame */
         ZSTD_initDStream_usingDict(zd, CNBuffer, 128 KB);
         r=1;
-        while (r) {   /* normal frame */
+        while (r) {
             inBuff.size = inBuff.pos + 1;
             outBuff.size = outBuff.pos + 1;
             r = ZSTD_decompressStream(zd, &outBuff, &inBuff);
@@ -322,6 +324,8 @@ _output_error:
 }
 
 
+/* ======   Fuzzer tests   ====== */
+
 static size_t findDiff(const void* buf1, const void* buf2, size_t max)
 {
     const BYTE* b1 = (const BYTE*)buf1;
@@ -413,8 +417,8 @@ static int fuzzerTests(U32 seed, U32 nbTests, unsigned startTest, double compres
         FUZ_rand(&coreSeed);
         lseed = coreSeed ^ prime1;
 
-        /* states full reset (unsynchronized) */
-        /* some issues only happen when reusing states in a specific sequence of parameters */
+        /* states full reset (deliberately not synchronized) */
+        /* some issues can only happen when reusing states */
         if ((FUZ_rand(&lseed) & 0xFF) == 131) { ZSTD_freeCStream(zc); zc = ZSTD_createCStream(); }
         if ((FUZ_rand(&lseed) & 0xFF) == 132) { ZSTD_freeDStream(zd); zd = ZSTD_createDStream(); }