diff --git a/ide/vs2019/mimalloc.vcxproj b/ide/vs2019/mimalloc.vcxproj
index 98dee520..9f967d94 100644
--- a/ide/vs2019/mimalloc.vcxproj
+++ b/ide/vs2019/mimalloc.vcxproj
@@ -92,7 +92,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
       <ConformanceMode>true</ConformanceMode>
@@ -138,7 +138,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <ConformanceMode>true</ConformanceMode>
@@ -166,7 +166,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <ConformanceMode>true</ConformanceMode>
diff --git a/src/options.c b/src/options.c
index 859b3871..261dcc14 100644
--- a/src/options.c
+++ b/src/options.c
@@ -116,7 +116,7 @@ void _mi_options_init(void) {
   mi_max_warning_count = mi_option_get(mi_option_max_warnings);
 }
 
-long mi_option_get(mi_option_t option) {
+mi_decl_nodiscard long mi_option_get(mi_option_t option) {
   mi_assert(option >= 0 && option < _mi_option_last);
   mi_option_desc_t* desc = &options[option];
   mi_assert(desc->option == option);  // index should match the option
@@ -142,7 +142,7 @@ void mi_option_set_default(mi_option_t option, long value) {
   }
 }
 
-bool mi_option_is_enabled(mi_option_t option) {
+mi_decl_nodiscard bool mi_option_is_enabled(mi_option_t option) {
   return (mi_option_get(option) != 0);
 }