diff --git a/src/ClassiCube.vcxproj b/src/ClassiCube.vcxproj
index 5b819ca8b..befcbd881 100644
--- a/src/ClassiCube.vcxproj
+++ b/src/ClassiCube.vcxproj
@@ -101,6 +101,7 @@
       <PrecompiledHeaderFile />
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
+      <TreatSpecificWarningsAsErrors>4716;4013</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -122,6 +123,7 @@
       <PrecompiledHeaderFile />
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <BufferSecurityCheck>false</BufferSecurityCheck>
+      <TreatSpecificWarningsAsErrors>4716;4013</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -147,6 +149,7 @@
       <AdditionalOptions>
       </AdditionalOptions>
       <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
+      <TreatSpecificWarningsAsErrors>4716;4013</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -176,6 +179,7 @@
       <AdditionalOptions>
       </AdditionalOptions>
       <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
+      <TreatSpecificWarningsAsErrors>4716;4013</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/src/ExtMath.c b/src/ExtMath.c
index 894c48720..b37fa472b 100644
--- a/src/ExtMath.c
+++ b/src/ExtMath.c
@@ -82,6 +82,7 @@ double Math_FastLog(double x) {
 	/* so log(x) = exp*log(2) + log(mantissa) */
 
 	/* now need to work out log(mantissa) */
+	return 0;
 }
 
 double Math_FastExp(double x) {
@@ -91,6 +92,7 @@ double Math_FastExp(double x) {
 	/* so exp(x) = 2^k           * exp(f) */
 
 	/* now need to work out exp(f) */
+	return 0;
 }