diff --git a/src/coreclr/runtime.proj b/src/coreclr/runtime.proj
index b20e9a35fc87ab..1869995f9ada72 100644
--- a/src/coreclr/runtime.proj
+++ b/src/coreclr/runtime.proj
@@ -43,7 +43,7 @@
                                    '$(PgoInstrument)' != 'true'"
                                    Include="-enforcepgo" />
       <_CoreClrBuildArg Condition="'$(Ninja)' == 'true' and !$([MSBuild]::IsOsPlatform(Windows))" Include="-ninja" />
-      <_CoreClrBuildArg Condition="'$(Ninja)' != 'true' and !$([MSBuild]::IsOsPlatform(Windows))" Include="-ninja false" />
+      <_CoreClrBuildArg Condition="'$(Ninja)' == 'false' and !$([MSBuild]::IsOsPlatform(Windows))" Include="-ninja false" />
       <_CoreClrBuildArg Condition="'$(Ninja)' == 'false' and $([MSBuild]::IsOsPlatform(Windows))" Include="-msbuild" />
       <_CoreClrBuildArg Condition="'$(PgoInstrument)' == 'true'" Include="-pgoinstrument" />
       <_CoreClrBuildArg Condition="'$(NativeOptimizationDataSupported)' == 'true' and '$(NoPgoOptimize)' != 'true' and '$(PgoInstrument)' != 'true'" Include="-pgodatapath &quot;$(PgoPackagePath)&quot;" />
diff --git a/src/native/corehost/corehost.proj b/src/native/corehost/corehost.proj
index 6c0160c61aa655..81496c3b80ce50 100644
--- a/src/native/corehost/corehost.proj
+++ b/src/native/corehost/corehost.proj
@@ -85,7 +85,7 @@
       <BuildArgs Condition="'$(CppCompilerAndLinker)' != ''">$(BuildArgs) $(CppCompilerAndLinker)</BuildArgs>
       <BuildArgs Condition="'$(CMakeArgs)' != ''">$(BuildArgs) -cmakeargs "$(CMakeArgs)"</BuildArgs>
       <BuildArgs Condition="'$(Ninja)' == 'true'">$(BuildArgs) -ninja</BuildArgs>
-      <BuildArgs Condition="'$(Ninja)' != 'true'">$(BuildArgs) -ninja false</BuildArgs>
+      <BuildArgs Condition="'$(Ninja)' == 'false'">$(BuildArgs) -ninja false</BuildArgs>
       <BuildArgs>$(BuildArgs) -runtimeflavor $(RuntimeFlavor)</BuildArgs>
       <BuildArgs Condition="'$(EnableNativeSanitizers)' != ''">$(BuildArgs) -fsanitize=$(EnableNativeSanitizers)</BuildArgs>
       <BuildArgs Condition="'$(OfficialBuildId)' != ''">$(BuildArgs) /p:OfficialBuildId="$(OfficialBuildId)"</BuildArgs>
diff --git a/src/native/libs/build-native.proj b/src/native/libs/build-native.proj
index ac7308eb4e0f25..ca3fcc345c9b31 100644
--- a/src/native/libs/build-native.proj
+++ b/src/native/libs/build-native.proj
@@ -40,7 +40,7 @@
           Condition="!$([MSBuild]::IsOsPlatform(Windows))">
     <PropertyGroup>
       <_BuildNativeArgs Condition="'$(Ninja)' == 'true'">$(_BuildNativeArgs) ninja</_BuildNativeArgs>
-      <_BuildNativeArgs Condition="'$(Ninja)' != 'true'">$(_BuildNativeArgs) ninja false</_BuildNativeArgs>
+      <_BuildNativeArgs Condition="'$(Ninja)' == 'false'">$(_BuildNativeArgs) ninja false</_BuildNativeArgs>
       <!--
         MSBuildNodeCount should a good approximation for how many procs to use for native build, if we find that doesn't work
         then we should consider calling Environment.ProcessorCount