diff --git a/include/etl/ratio.h b/include/etl/ratio.h
index c0f03436..dfc94e86 100644
--- a/include/etl/ratio.h
+++ b/include/etl/ratio.h
@@ -28,13 +28,13 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 ******************************************************************************/
 
-#ifndef __ETL_RATIO__
-#define __ETL_RATIO__
+#ifndef ETL_RATIO_INCLUDED
+#define ETL_RATIO_INCLUDED
 
 #include <stdint.h>
 
 ///\defgroup ratio ratio
-///\ingroup utilities
+///\ingroup maths
 
 namespace etl
 {
@@ -48,8 +48,8 @@ namespace etl
   #if INT_MAX > INT32_MAX
     typedef ratio<1, 1000000000000000000000000> yocto;
     typedef ratio<1, 1000000000000000000000>    zepto;
-    typedef ratio<1, 1000000000000000000>       atto
-    typedef ratio<1, 1000000000000000>          femto
+    typedef ratio<1, 1000000000000000000>       atto;
+    typedef ratio<1, 1000000000000000>          femto;
     typedef ratio<1, 1000000000000>             pico;
   #endif
 
@@ -63,8 +63,8 @@ namespace etl
     typedef ratio<1, 100>                       centi;
     typedef ratio<1, 10>                        deci;
     typedef ratio<10, 1>                        deca;
-    typedef ratio<100, 1>                       hecto
-    typedef ratio<1000, 1>                      kilo
+    typedef ratio<100, 1>                       hecto;
+    typedef ratio<1000, 1>                      kilo;
   #endif
 
   #if (INT_MAX >= INT32_MAX)
diff --git a/test/vs2017/etl.vcxproj b/test/vs2017/etl.vcxproj
index 4c47ec11..58a57d4c 100644
--- a/test/vs2017/etl.vcxproj
+++ b/test/vs2017/etl.vcxproj
@@ -394,6 +394,7 @@
     <ClInclude Include="..\..\include\etl\profiles\gcc_windows_x86.h" />
     <ClInclude Include="..\..\include\etl\profiles\msvc_x86.h" />
     <ClInclude Include="..\..\include\etl\profiles\ticc.h" />
+    <ClInclude Include="..\..\include\etl\ratio.h" />
     <ClInclude Include="..\..\include\etl\scheduler.h" />
     <ClInclude Include="..\..\include\etl\smallest_generator.h" />
     <ClInclude Include="..\..\include\etl\queue_spsc_atomic.h" />
diff --git a/test/vs2017/etl.vcxproj.filters b/test/vs2017/etl.vcxproj.filters
index d8a39e36..a67689f1 100644
--- a/test/vs2017/etl.vcxproj.filters
+++ b/test/vs2017/etl.vcxproj.filters
@@ -627,6 +627,9 @@
     <ClInclude Include="..\..\..\unittest-cpp\UnitTest++\AssertException.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\include\etl\ratio.h">
+      <Filter>ETL\Maths</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\main.cpp">