diff --git a/files/source/mjpeg_decoder.cc b/files/source/mjpeg_decoder.cc
index b43c008..3acf956 100644
--- a/files/source/mjpeg_decoder.cc
+++ b/files/source/mjpeg_decoder.cc
@@ -427,7 +427,15 @@
 }
 
 void skip_input_data(j_decompress_ptr cinfo, long num_bytes) {  // NOLINT
-  cinfo->src->next_input_byte += num_bytes;
+  jpeg_source_mgr* src = cinfo->src;
+  size_t bytes = static_cast<size_t>(num_bytes);
+  if(bytes > src->bytes_in_buffer) {
+    src->next_input_byte = nullptr;
+    src->bytes_in_buffer = 0;
+  } else {
+    src->next_input_byte += bytes;
+    src->bytes_in_buffer -= bytes;
+  }
 }
 
 void term_source(j_decompress_ptr cinfo) {
diff --git a/files/source/mjpeg_validate.cc b/files/source/mjpeg_validate.cc
index 1a17dd7..cc38b99 100644
--- a/files/source/mjpeg_validate.cc
+++ b/files/source/mjpeg_validate.cc
@@ -47,7 +47,8 @@
     // ERROR: Invalid jpeg size: sample_size
     return LIBYUV_FALSE;
   }
-  if (sample[0] != 0xff || sample[1] != 0xd8) {  // SOI marker
+  // SOI marker
+  if (sample[0] != 0xff || sample[1] != 0xd8 || sample[2] != 0xff) {
     // ERROR: Invalid jpeg initial start code
     return LIBYUV_FALSE;
   }
diff --git a/files/unit_test/convert_test.cc b/files/unit_test/convert_test.cc
index 4156435..3e2eea8 100644
--- a/files/unit_test/convert_test.cc
+++ b/files/unit_test/convert_test.cc
@@ -1274,6 +1274,7 @@
   // EOI, SOI. Expect pass.
   orig_pixels[0] = 0xff;
   orig_pixels[1] = 0xd8;  // SOI.
+  orig_pixels[2] = 0xff;
   orig_pixels[kSize - kOff + 0] = 0xff;
   orig_pixels[kSize - kOff + 1] = 0xd9;  // EOI.
   for (int times = 0; times < benchmark_iterations_; ++times) {
@@ -1300,6 +1301,7 @@
   // EOI, SOI. Expect pass.
   orig_pixels[0] = 0xff;
   orig_pixels[1] = 0xd8;  // SOI.
+  orig_pixels[2] = 0xff;
   orig_pixels[kSize - kOff + 0] = 0xff;
   orig_pixels[kSize - kOff + 1] = 0xd9;  // EOI.
   for (int times = 0; times < benchmark_iterations_; ++times) {
@@ -1333,6 +1335,7 @@
   // SOI but no EOI. Expect fail.
   orig_pixels[0] = 0xff;
   orig_pixels[1] = 0xd8;  // SOI.
+  orig_pixels[2] = 0xff;
   for (int times = 0; times < benchmark_iterations_; ++times) {
     EXPECT_FALSE(ValidateJpeg(orig_pixels, kSize));
   }
@@ -1357,6 +1360,7 @@
     // Add SOI so frame will be scanned.
     orig_pixels[0] = 0xff;
     orig_pixels[1] = 0xd8;  // SOI.
+    orig_pixels[2] = 0xff;
     orig_pixels[kSize - 1] = 0xff;
     ValidateJpeg(orig_pixels, kSize);  // Failure normally expected.
     free_aligned_buffer_page_end(orig_pixels);
@@ -1381,6 +1385,7 @@
   memset(orig_pixels, 0, kSize);
   orig_pixels[0] = 0xff;
   orig_pixels[1] = 0xd8;  // SOI.
+  orig_pixels[2] = 0xff;
   orig_pixels[kSize - kOff + 0] = 0xff;
   orig_pixels[kSize - kOff + 1] = 0xd9;  // EOI.
 
@@ -1414,6 +1419,7 @@
   memset(orig_pixels, 0, kSize);
   orig_pixels[0] = 0xff;
   orig_pixels[1] = 0xd8;  // SOI.
+  orig_pixels[2] = 0xff;
   orig_pixels[kSize - kOff + 0] = 0xff;
   orig_pixels[kSize - kOff + 1] = 0xd9;  // EOI.