diff --git a/programs/datagen.c b/programs/datagen.c
index 026b9a18..88f48731 100644
--- a/programs/datagen.c
+++ b/programs/datagen.c
@@ -55,8 +55,9 @@ static U32 RDG_rand(U32* src)
     return rand32 >> 5;
 }
 
+typedef U32 fixedPoint_24_8;
 
-static void RDG_fillLiteralDistrib(BYTE* ldt, double ld)
+static void RDG_fillLiteralDistrib(BYTE* ldt, fixedPoint_24_8 ld)
 {
     BYTE const firstChar = (ld<=0.0) ?   0 : '(';
     BYTE const lastChar  = (ld<=0.0) ? 255 : '}';
@@ -65,7 +66,7 @@ static void RDG_fillLiteralDistrib(BYTE* ldt, double ld)
 
     if (ld<=0.0) ld = 0.0;
     for (u=0; u<LTSIZE; ) {
-        U32 const weight = (U32)((double)(LTSIZE - u) * ld) + 1;
+        U32 const weight = (((LTSIZE - u) * ld) >> 8) + 1;
         U32 const end = MIN ( u + weight , LTSIZE);
         while (u < end) ldt[u++] = character;
         character++;
@@ -92,7 +93,8 @@ static U32 RDG_randLength(U32* seedPtr)
     return (RDG_rand(seedPtr) & 0x1FF) + 0xF;
 }
 
-static void RDG_genBlock(void* buffer, size_t buffSize, size_t prefixSize, double matchProba, const BYTE* ldt, U32* seedPtr)
+static void RDG_genBlock(void* buffer, size_t buffSize, size_t prefixSize,
+                         double matchProba, const BYTE* ldt, U32* seedPtr)
 {
     BYTE* const buffPtr = (BYTE*)buffer;
     U32 const matchProba32 = (U32)(32768 * matchProba);
@@ -128,13 +130,13 @@ static void RDG_genBlock(void* buffer, size_t buffSize, size_t prefixSize, doubl
             U32 const randOffset = RDG_rand15Bits(seedPtr) + 1;
             U32 const offset = repeatOffset ? prevOffset : (U32) MIN(randOffset , pos);
             size_t match = pos - offset;
-            while (pos < d) buffPtr[pos++] = buffPtr[match++];   /* correctly manages overlaps */
+            while (pos < d) { buffPtr[pos++] = buffPtr[match++];   /* correctly manages overlaps */ }
             prevOffset = offset;
         } else {
             /* Literal (noise) */
             U32 const length = RDG_randLength(seedPtr);
             U32 const d = (U32) MIN(pos + length, buffSize);
-            while (pos < d) buffPtr[pos++] = RDG_genChar(seedPtr, ldt);
+            while (pos < d) { buffPtr[pos++] = RDG_genChar(seedPtr, ldt); }
     }   }
 }
 
@@ -145,7 +147,7 @@ void RDG_genBuffer(void* buffer, size_t size, double matchProba, double litProba
     BYTE ldt[LTSIZE];
     memset(ldt, '0', sizeof(ldt));  /* yes, character '0', this is intentional */
     if (litProba<=0.0) litProba = matchProba / 4.5;
-    RDG_fillLiteralDistrib(ldt, litProba);
+    RDG_fillLiteralDistrib(ldt, (fixedPoint_24_8)(litProba * 256 + 0.001));
     RDG_genBlock(buffer, size, 0, matchProba, ldt, &seed32);
 }
 
@@ -163,7 +165,7 @@ void RDG_genStdout(unsigned long long size, double matchProba, double litProba,
     if (buff==NULL) { perror("datagen"); exit(1); }
     if (litProba<=0.0) litProba = matchProba / 4.5;
     memset(ldt, '0', sizeof(ldt));   /* yes, character '0', this is intentional */
-    RDG_fillLiteralDistrib(ldt, litProba);
+    RDG_fillLiteralDistrib(ldt, (fixedPoint_24_8)(litProba * 256 + 0.001));
     SET_BINARY_MODE(stdout);
 
     /* Generate initial dict */
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 9553ea71..e23bdec9 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -308,7 +308,7 @@ static int FUZ_mallocTests(unsigned seed, double compressibility, unsigned part)
 *   Unit tests
 =============================================*/
 
-static int basicUnitTests(U32 seed, double compressibility)
+static int basicUnitTests(U32 const seed, double compressibility)
 {
     size_t const CNBuffSize = 5 MB;
     void* const CNBuffer = malloc(CNBuffSize);
@@ -1053,14 +1053,14 @@ static int basicUnitTests(U32 seed, double compressibility)
             size_t const contentSize = 9 KB;
             const void* const dict = (const char*)CNBuffer;
             const void* const contentStart = (const char*)dict + flatdictSize;
-            size_t const target_nodict_cSize[22+1] = { 3840, 3740, 3840, 3810, 3750,
-                                                       3750, 3740, 3740, 3740, 3740,
-                                                       3740, 3670, 3660, 3660, 3660,
-                                                       3650, 3650, 3650, 3650, 3650,
-                                                       3650, 3650, 3650 };
-            size_t const target_wdict_cSize[22+1] =  { 2820, 2850, 2860, 2820, 2940,
-                                                       2930, 2930, 2920, 2890, 2890,
-                                                       2890, 2900, 2900, 2770, 2760,
+            size_t const target_nodict_cSize[22+1] = { 3840, 3770, 3870, 3830, 3770,
+                                                       3770, 3770, 3770, 3750, 3750,
+                                                       3740, 3670, 3670, 3660, 3660,
+                                                       3660, 3660, 3660, 3660, 3660,
+                                                       3660, 3660, 3660 };
+            size_t const target_wdict_cSize[22+1] =  { 2830, 2890, 2890, 2820, 2940,
+                                                       2950, 2950, 2920, 2900, 2890,
+                                                       2910, 2910, 2910, 2770, 2760,
                                                        2750, 2750, 2750, 2750, 2750,
                                                        2750, 2750, 2750 };
             int l = 1;
@@ -1069,6 +1069,7 @@ static int basicUnitTests(U32 seed, double compressibility)
             DISPLAYLEVEL(3, "test%3i : flat-dictionary efficiency test : \n", testNb++);
             assert(maxLevel == 22);
             RDG_genBuffer(CNBuffer, flatdictSize + contentSize, compressibility, 0., seed);
+            DISPLAYLEVEL(4, "content hash : %016llx;  dict hash : %016llx \n", XXH64(contentStart, contentSize, 0), XXH64(dict, flatdictSize, 0));
 
             for ( ; l <= maxLevel; l++) {
                 size_t const nodict_cSize = ZSTD_compress(compressedBuffer, compressedBufferSize,
@@ -1646,6 +1647,7 @@ static int basicUnitTests(U32 seed, double compressibility)
         size_t const sampleUnitSize = 8 KB;
         U32 const nbSamples = (U32)(totalSampleSize / sampleUnitSize);
         size_t* const samplesSizes = (size_t*) malloc(nbSamples * sizeof(size_t));
+        U32 seed32 = seed;
         ZDICT_cover_params_t params;
         U32 dictID;
 
@@ -1658,8 +1660,8 @@ static int basicUnitTests(U32 seed, double compressibility)
         DISPLAYLEVEL(3, "test%3i : ZDICT_trainFromBuffer_cover : ", testNb++);
         { U32 u; for (u=0; u<nbSamples; u++) samplesSizes[u] = sampleUnitSize; }
         memset(&params, 0, sizeof(params));
-        params.d = 1 + (FUZ_rand(&seed) % 16);
-        params.k = params.d + (FUZ_rand(&seed) % 256);
+        params.d = 1 + (FUZ_rand(&seed32) % 16);
+        params.k = params.d + (FUZ_rand(&seed32) % 256);
         dictSize = ZDICT_trainFromBuffer_cover(dictBuffer, dictSize,
                                                CNBuffer, samplesSizes, nbSamples,
                                                params);