diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c51b0f8d..779ebc77 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -46,7 +46,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Build windows-i386
+    - name: Build windows-amd64
       run: |
         git submodule init && git submodule update
         ./waf.bat configure -T debug -8
diff --git a/engine/tmessage.cpp b/engine/tmessage.cpp
index 72c65f22..c5e00116 100644
--- a/engine/tmessage.cpp
+++ b/engine/tmessage.cpp
@@ -322,10 +322,17 @@ int ParseDirective( const char *pText )
 		{
 			if ( ParseFloats( pText, tempFloat, 4 ) )
 			{
-				for ( int i = 0; i < 4; ++i )
+				// that's original code, msvc2015 generates illegal instruction on amd64 architecture
+				/*for ( int i = 0; i < 4; ++i )
 				{
 					gMessageParms.boxcolor[ i ] = (byte)(int)tempFloat[ i ];
-				}
+				}*/
+
+				// workaround
+				gMessageParms.boxcolor[0] = (int)tempFloat[0];
+				gMessageParms.boxcolor[1] = (int)tempFloat[1];
+				gMessageParms.boxcolor[2] = (int)tempFloat[2];
+				gMessageParms.boxcolor[3] = (int)tempFloat[3];
 			}
 		}
 		else if ( IsToken( pText, "clearmessage" ) )