diff --git a/core-buffer/test/test_bitshuffle.cpp b/core-buffer/test/test_bitshuffle.cpp
index a8bf06b..7f7a919 100644
--- a/core-buffer/test/test_bitshuffle.cpp
+++ b/core-buffer/test/test_bitshuffle.cpp
@@ -13,16 +13,20 @@ TEST(bitshuffle, simple_compression)
     auto compress_buffer_size = bshuf_compress_lz4_bound(
             size, elem_size, block_size);
 
-    auto frame_buffer = make_unique<char[]>(MODULE_N_BYTES);
+    auto frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
     auto compress_buffer = make_unique<char[]>(compress_buffer_size);
 
+    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
+        frame_buffer[i] = i%100;
+    }
+
     auto compressed_size = bshuf_compress_lz4(
             frame_buffer.get(), compress_buffer.get(),
             size, elem_size, block_size);
 
     ASSERT_TRUE(compressed_size > 0);
 
-    auto out_frame_buffer = make_unique<char[]>(MODULE_N_BYTES);
+    auto out_frame_buffer = make_unique<uint16_t[]>(MODULE_N_PIXELS);
     auto consumed_bytes = bshuf_decompress_lz4(
             compress_buffer.get(), out_frame_buffer.get(),
             size, elem_size, block_size);
@@ -30,4 +34,8 @@ TEST(bitshuffle, simple_compression)
     ASSERT_TRUE(consumed_bytes > 0);
 
     ASSERT_EQ(compressed_size, consumed_bytes);
+
+    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
+        ASSERT_EQ(out_frame_buffer[i], frame_buffer[i]);
+    }
 }
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