diff --git a/lib/dictBuilder/zdict.c b/lib/dictBuilder/zdict.c
index 863a8edf7..32f863660 100644
--- a/lib/dictBuilder/zdict.c
+++ b/lib/dictBuilder/zdict.c
@@ -104,10 +104,11 @@ size_t ZDICT_getDictHeaderSize(const void* dictBuffer, size_t dictSize)
 {
     if (dictSize <= 8 || MEM_readLE32(dictBuffer) != ZSTD_MAGIC_DICTIONARY) return 0;
 
-    {   ZSTD_entropyDTables_t dummyEntropyTables;
-        size_t headerSize;
-        dummyEntropyTables.hufTable[0] = (HUF_DTable)((HufLog)*0x1000001);
-        headerSize = ZSTD_loadDEntropy(&dummyEntropyTables, dictBuffer, dictSize);
+    {   size_t headerSize;
+        ZSTD_entropyDTables_t* dummyEntropyTables = (ZSTD_entropyDTables_t*)malloc(sizeof(ZSTD_entropyDTables_t));
+        dummyEntropyTables->hufTable[0] = (HUF_DTable)((HufLog)*0x1000001);
+        headerSize = ZSTD_loadDEntropy(dummyEntropyTables, dictBuffer, dictSize);
+        free(dummyEntropyTables);
         return ZSTD_isError(headerSize) ? 0 : headerSize;
     }
 }
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 9be92471e..9a05daab7 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -1137,7 +1137,7 @@ static int basicUnitTests(U32 const seed, double compressibility)
         size_t* const samplesSizes = (size_t*) malloc(nbSamples * sizeof(size_t));
         size_t dictSize;
         U32 dictID;
-        U32 dictHeaderSize;
+        size_t dictHeaderSize;
 
         if (dictBuffer==NULL || samplesSizes==NULL) {
             free(dictBuffer);