diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 541b776f1..09f048239 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -4820,6 +4820,8 @@ static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
     case ZSTD_dfast:
 #ifndef ZSTD_EXCLUDE_DFAST_BLOCK_COMPRESSOR
         ZSTD_fillDoubleHashTable(ms, iend, dtlm, tfp);
+#else
+        assert(0); /* shouldn't be called: cparams should've been adjusted. */
 #endif
         break;
 
@@ -4845,6 +4847,8 @@ static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
                 DEBUGLOG(4, "Using chain-based hash table for lazy dict");
             }
         }
+#else
+        assert(0); /* shouldn't be called: cparams should've been adjusted. */
 #endif
         break;
 
@@ -4857,6 +4861,8 @@ static size_t ZSTD_loadDictionaryContent(ZSTD_matchState_t* ms,
  || !defined(ZSTD_EXCLUDE_BTULTRA_BLOCK_COMPRESSOR)
         assert(srcSize >= HASH_READ_SIZE);
         ZSTD_updateTree(ms, iend-HASH_READ_SIZE, iend);
+#else
+        assert(0); /* shouldn't be called: cparams should've been adjusted. */
 #endif
         break;
 
diff --git a/lib/compress/zstd_ldm.c b/lib/compress/zstd_ldm.c
index 8581e2356..eda45816e 100644
--- a/lib/compress/zstd_ldm.c
+++ b/lib/compress/zstd_ldm.c
@@ -248,6 +248,8 @@ static size_t ZSTD_ldm_fillFastTables(ZSTD_matchState_t* ms,
     case ZSTD_dfast:
 #ifndef ZSTD_EXCLUDE_DFAST_BLOCK_COMPRESSOR
         ZSTD_fillDoubleHashTable(ms, iend, ZSTD_dtlm_fast, ZSTD_tfp_forCCtx);
+#else
+        assert(0); /* shouldn't be called: cparams should've been adjusted. */
 #endif
         break;