diff --git a/Sources/Plasma/FeatureLib/pfPython/plPythonPack.cpp b/Sources/Plasma/FeatureLib/pfPython/plPythonPack.cpp
index 42a85a43..025a9ff6 100644
--- a/Sources/Plasma/FeatureLib/pfPython/plPythonPack.cpp
+++ b/Sources/Plasma/FeatureLib/pfPython/plPythonPack.cpp
@@ -227,7 +227,7 @@ PyObject* plPythonPack::OpenPacked(const plString& fileName)
 bool plPythonPack::IsPackedFile(const plString& fileName)
 {
     if (!Open())
-        return nil;
+        return false;
 
     plString pythonName = fileName + ".py";
 
diff --git a/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp b/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
index 564bd825..630f8077 100644
--- a/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
+++ b/Sources/Plasma/PubUtilLib/plAudio/plAudioSystem.cpp
@@ -1247,7 +1247,7 @@ bool plgAudioSys::SupportsEAX(const char *deviceName)
     {
         return fSys->SupportsEAX(deviceName);
     }
-    return nil;
+    return false;
 }
 
 void plgAudioSys::RegisterSoftSound( const plKey soundKey )
diff --git a/Sources/Plasma/PubUtilLib/plResMgr/plResManager.cpp b/Sources/Plasma/PubUtilLib/plResMgr/plResManager.cpp
index ac6d347f..e2a6ff4e 100644
--- a/Sources/Plasma/PubUtilLib/plResMgr/plResManager.cpp
+++ b/Sources/Plasma/PubUtilLib/plResMgr/plResManager.cpp
@@ -361,7 +361,7 @@ bool plResManager::IReadObject(plKeyImp* pKey, hsStream *stream)
 
     hsAssert(pKey, "Null Key");
     if (pKey->GetUoid().GetLoadMask().DontLoad())
-        return nil;
+        return false;
 
     hsAssert(pKey->GetStartPos() != uint32_t(-1), "Missing StartPos");
     hsAssert(pKey->GetDataLen() != uint32_t(-1), "Missing Data Length");
diff --git a/Sources/Tools/plFontConverter/plFontFreeType.cpp b/Sources/Tools/plFontConverter/plFontFreeType.cpp
index 686cb4ec..b2414779 100644
--- a/Sources/Tools/plFontConverter/plFontFreeType.cpp
+++ b/Sources/Tools/plFontConverter/plFontFreeType.cpp
@@ -221,7 +221,7 @@ bool    plFontFreeType::ImportFreeType( const plFileName &fontPath, Options *opt
             if( ch->fBitmapOff > ( ( fWidth * ( fHeight - ftBitmap->bitmap.rows ) * fBPP ) >> 3 ) )
             {
                 hsAssert( false, "Invalid position found in IGetFreeCharData()" );
-                return nil;
+                return false;
             }
 
             // Set these now, since setting them before would've changed the IGetFreeCharData results