diff --git a/src/nanoarrow/buffer_inline.h b/src/nanoarrow/buffer_inline.h
index 622945f5f..efb5ca712 100644
--- a/src/nanoarrow/buffer_inline.h
+++ b/src/nanoarrow/buffer_inline.h
@@ -222,8 +222,7 @@ static inline int64_t _ArrowBytesForBits(int64_t bits) {
   return (bits >> 3) + ((bits & 7) != 0);
 }
 
-static inline void _ArrowBitmapUnpackInt8(const uint8_t* bits, int8_t* out) {
-  const uint8_t word = *bits;
+static inline void _ArrowBitmapUnpackInt8(const uint8_t word, int8_t* out) {
   out[0] = (word >> 0) & 1;
   out[1] = (word >> 1) & 1;
   out[2] = (word >> 2) & 1;
@@ -277,7 +276,7 @@ static inline void ArrowBitmapUnpackInt8Unsafe(const uint8_t* bits, int64_t star
 
   // middle bytes
   for (int64_t i = bytes_begin + 1; i < bytes_last_valid; i++) {
-    _ArrowBitmapUnpackInt8(&bits[i], out);
+    _ArrowBitmapUnpackInt8(bits[i], out);
     out += 8;
   }
 
diff --git a/src/nanoarrow/buffer_test.cc b/src/nanoarrow/buffer_test.cc
index b2ced1428..1907d3712 100644
--- a/src/nanoarrow/buffer_test.cc
+++ b/src/nanoarrow/buffer_test.cc
@@ -290,28 +290,6 @@ TEST(BitmapTest, BitmapTestBitmapUnpackInt8Unsafe) {
     EXPECT_EQ(result[i], 1);
   }
 
-  bitmap[2] = 0xfd;
-  ArrowBitmapUnpackInt8Unsafe(bitmap, 0, sizeof(result), result);
-  EXPECT_EQ(result[16 + 0], 1);
-  EXPECT_EQ(result[16 + 1], 0);
-  EXPECT_EQ(result[16 + 2], 1);
-  EXPECT_EQ(result[16 + 3], 1);
-  EXPECT_EQ(result[16 + 4], 1);
-  EXPECT_EQ(result[16 + 5], 1);
-  EXPECT_EQ(result[16 + 6], 1);
-  EXPECT_EQ(result[16 + 7], 1);
-
-  bitmap[2] = 0x02;
-  ArrowBitmapUnpackInt8Unsafe(bitmap, 0, sizeof(result), result);
-  EXPECT_EQ(result[16 + 0], 0);
-  EXPECT_EQ(result[16 + 1], 1);
-  EXPECT_EQ(result[16 + 2], 0);
-  EXPECT_EQ(result[16 + 3], 0);
-  EXPECT_EQ(result[16 + 4], 0);
-  EXPECT_EQ(result[16 + 5], 0);
-  EXPECT_EQ(result[16 + 6], 0);
-  EXPECT_EQ(result[16 + 7], 0);
-
   bitmap[0] = 0x93;  // 10010011
   bitmap[1] = 0x55;  // 01010101
   bitmap[2] = 0xaa;  // 10101010