diff --git a/lib-src/FileDialog/FileDialog.cpp b/lib-src/FileDialog/FileDialog.cpp
index 01073ac35..a0a8c2764 100644
--- a/lib-src/FileDialog/FileDialog.cpp
+++ b/lib-src/FileDialog/FileDialog.cpp
@@ -106,7 +106,7 @@ wxString FileSelector(const wxChar *title,
       {
          if (filters[n].Contains(defaultExtension))
          {
-            filterIndex = n;
+            filterIndex = (int)n; // Convert to int to avoid compiler warning, because we probably do not need many tens of thousands of filters.
             break;
          }
       }
diff --git a/lib-src/portaudio-v19/src/hostapi/wmme/pa_win_wmme.c b/lib-src/portaudio-v19/src/hostapi/wmme/pa_win_wmme.c
index 2436d8de1..54b14c0f8 100644
--- a/lib-src/portaudio-v19/src/hostapi/wmme/pa_win_wmme.c
+++ b/lib-src/portaudio-v19/src/hostapi/wmme/pa_win_wmme.c
@@ -820,7 +820,6 @@ static PaError InitializeOutputDeviceInfo( PaWinMmeHostApiRepresentation *winMme
     MMRESULT mmresult;
     WAVEOUTCAPS woc;
     PaDeviceInfo *deviceInfo = &winMmeDeviceInfo->inheritedDeviceInfo;
-    int wdmksDeviceOutputChannelCountIsKnown;
 
     *success = 0;
 
@@ -886,6 +885,7 @@ static PaError InitializeOutputDeviceInfo( PaWinMmeHostApiRepresentation *winMme
     }
 
 #ifdef PAWIN_USE_WDMKS_DEVICE_INFO
+    int wdmksDeviceOutputChannelCountIsKnown;
     wdmksDeviceOutputChannelCountIsKnown = QueryWaveOutKSFilterMaxChannels( 
 			winMmeOutputDeviceId, &deviceInfo->maxOutputChannels );
     if( wdmksDeviceOutputChannelCountIsKnown && !winMmeDeviceInfo->deviceOutputChannelCountIsKnown )
diff --git a/src/effects/BassTreble.cpp b/src/effects/BassTreble.cpp
index fafd0ab22..c7695ebe1 100644
--- a/src/effects/BassTreble.cpp
+++ b/src/effects/BassTreble.cpp
@@ -53,7 +53,7 @@ wxString EffectBassTreble::GetEffectDescription() {
 
 bool EffectBassTreble::NewTrackSimpleMono()
 {
-   const float slope = 0.4;   // same slope for both filters
+   const float slope = 0.4f;   // same slope for both filters
    //(re)initialise filter parameters for low shelf
    xn1Bass=0;
    xn2Bass=0;