diff --git a/src/ifcparse/IfcSIPrefix.cpp b/src/ifcparse/IfcSIPrefix.cpp
index 7270c221f9..1d289ffb61 100644
--- a/src/ifcparse/IfcSIPrefix.cpp
+++ b/src/ifcparse/IfcSIPrefix.cpp
@@ -34,7 +34,7 @@ double IfcParse::IfcSIPrefixToValue(const std::string& v) {
 	else if ( v == "MEGA"  ) return 1.e6;
 	else if ( v == "KILO"  ) return 1.e3;
 	else if ( v == "HECTO" ) return 1.e2;
-	else if ( v == "DECA"  ) return 1.;
+	else if ( v == "DECA"  ) return 1.e1;
 	else if ( v == "DECI"  ) return 1.e-1;
 	else if ( v == "CENTI" ) return 1.e-2;
 	else if ( v == "MILLI" ) return 1.e-3;
diff --git a/win/build-deps.cmd b/win/build-deps.cmd
index 6bb6a4e4c1..36787ae923 100644
--- a/win/build-deps.cmd
+++ b/win/build-deps.cmd
@@ -209,7 +209,7 @@ cd "%DEPENDENCY_DIR%"
 call cecho.cmd 0 13 "Building %DEPENDENCY_NAME% %BOOST_LIBS% Please be patient, this will take a while."
 IF EXIST "%DEPENDENCY_DIR%\bin.v2\project-cache.jam" del "%DEPS_DIR%\boost\bin.v2\project-cache.jam"
 
-call .\b2 toolset=%BOOST_TOOLSET% runtime-link=static address-model=%ARCH_BITS% -j%IFCOS_NUM_BUILD_PROCS% ^
+call .\b2 toolset=%BOOST_TOOLSET% runtime-link=static address-model=%ARCH_BITS% --abbreviate-paths -j%IFCOS_NUM_BUILD_PROCS% ^
     variant=%DEBUG_OR_RELEASE_LOWERCASE% %BOOST_WIN_API% %BOOST_LIBS% stage --stagedir=stage/%GEN_SHORTHAND% 
 
 IF NOT %ERRORLEVEL%==0 GOTO :Error