diff --git a/DirectXTex/BC.cpp b/DirectXTex/BC.cpp
index ab343a6..627ae31 100644
--- a/DirectXTex/BC.cpp
+++ b/DirectXTex/BC.cpp
@@ -807,7 +807,10 @@ void D3DXDecodeBC2(XMVECTOR *pColor, const uint8_t *pBC)
     DWORD dw = pBC2->bitmap[0];
 
     for(size_t i = 0; i < 8; ++i, dw >>= 4)
+    {
+        #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
         pColor[i] = XMVectorSetW( pColor[i], (float) (dw & 0xf) * (1.0f / 15.0f) );
+    }
 
     dw = pBC2->bitmap[1];
 
diff --git a/DirectXTex/BC4BC5.cpp b/DirectXTex/BC4BC5.cpp
index 30b8461..5df3502 100644
--- a/DirectXTex/BC4BC5.cpp
+++ b/DirectXTex/BC4BC5.cpp
@@ -379,6 +379,7 @@ void D3DXDecodeBC4U( XMVECTOR *pColor, const uint8_t *pBC )
 
     for (size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
     {
+        #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
         pColor[i] = XMVectorSet( pBC4->R(i), 0, 0, 1.0f);
     }       
 }
@@ -393,6 +394,7 @@ void D3DXDecodeBC4S(XMVECTOR *pColor, const uint8_t *pBC)
 
     for (size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
     {
+        #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
         pColor[i] = XMVectorSet( pBC4->R(i), 0, 0, 1.0f);
     }       
 }
@@ -454,6 +456,7 @@ void D3DXDecodeBC5U(XMVECTOR *pColor, const uint8_t *pBC)
 
     for (size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
     {
+        #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
         pColor[i] = XMVectorSet(pBCR->R(i), pBCG->R(i), 0, 1.0f);
     }       
 }
@@ -469,6 +472,7 @@ void D3DXDecodeBC5S(XMVECTOR *pColor, const uint8_t *pBC)
 
     for (size_t i = 0; i < NUM_PIXELS_PER_BLOCK; ++i)
     {
+        #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
         pColor[i] = XMVectorSet(pBCR->R(i), pBCG->R(i), 0, 1.0f);
     }       
 }
diff --git a/DirectXTex/BC6HBC7.cpp b/DirectXTex/BC6HBC7.cpp
index 1ff62ea..3c1e09b 100644
--- a/DirectXTex/BC6HBC7.cpp
+++ b/DirectXTex/BC6HBC7.cpp
@@ -1438,7 +1438,14 @@ void D3DX_BC6H::GeneratePaletteQuantized(const EncodeParams* pEP, const INTEndPn
     {
     case 3: aWeights = g_aWeights3; assert(uNumIndices <= 8); _Analysis_assume_(uNumIndices <= 8); break;
     case 4: aWeights = g_aWeights4; assert(uNumIndices <= 16); _Analysis_assume_(uNumIndices <= 16); break;
-    default: assert(false); for(size_t i=0; i < uNumIndices; ++i) aPalette[i] = INTColor(0,0,0); return;
+    default:
+        assert(false);
+        for(size_t i = 0; i < uNumIndices; ++i)
+        {
+            #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
+            aPalette[i] = INTColor(0,0,0);
+        }
+        return;
     }
 
     for (size_t i = 0; i < uNumIndices; ++i)
@@ -1818,7 +1825,14 @@ void D3DX_BC6H::GeneratePaletteUnquantized(const EncodeParams* pEP, size_t uRegi
     {
     case 3: aWeights = g_aWeights3; assert(uNumIndices <= 8); _Analysis_assume_(uNumIndices <= 8); break;
     case 4: aWeights = g_aWeights4; assert(uNumIndices <= 16); _Analysis_assume_(uNumIndices <= 16); break;
-    default: assert(false); for(size_t i = 0; i < uNumIndices; ++i) aPalette[i] = INTColor(0,0,0); return;
+    default:
+        assert(false);
+        for(size_t i = 0; i < uNumIndices; ++i)
+        {
+            #pragma prefast(suppress:22103, "writing blocks in two halves confuses tool")
+            aPalette[i] = INTColor(0,0,0);
+        }
+        return;
     }
 
     for(register size_t i = 0; i < uNumIndices; ++i)