diff --git a/kandinsky/fonts/rasterizer.c b/kandinsky/fonts/rasterizer.c
index 617bfc099..97c09aac2 100644
--- a/kandinsky/fonts/rasterizer.c
+++ b/kandinsky/fonts/rasterizer.c
@@ -232,8 +232,8 @@ int main(int argc, char * argv[]) {
     ENSURE(uncompressedGlyphBufferIndex == sizeOfUncompressedGlyphBuffer, "Error filling uncompressed buffer, only %d out of %d", uncompressedGlyphBufferIndex, sizeOfUncompressedGlyphBuffer);
 
     int sizeOfCompressedGlyphBuffer = LZ4_compress_HC(
-      uncompressedGlyphBuffer,
-      glyphData + lastOffset,
+      (const char *)uncompressedGlyphBuffer,
+      (char *)(glyphData + lastOffset),
       sizeOfUncompressedGlyphBuffer,
       maxGlyphDataSize - lastOffset,
       LZ4HC_CLEVEL_MAX
@@ -251,9 +251,9 @@ int main(int argc, char * argv[]) {
   size_t finalDataSize = lastOffset;
   size_t initialDataSize = GLYPH_COUNT * glyph_width * glyph_height;
 
-  fprintf(sourceFile, "/* Rasterized  = %5d bytes (%d glyphs x %d pixels)\n", initialDataSize, GLYPH_COUNT, glyph_width*glyph_height);
-  fprintf(sourceFile, " * Downsampled = %5d bytes (1/%d of rasterized)\n", initialDataSize*greyscaleBitsPerPixel/8, 8/greyscaleBitsPerPixel);
-  fprintf(sourceFile, " * Compressed  = %5d bytes (%.2f%% of rasterized) */\n", finalDataSize, 100.0*finalDataSize/initialDataSize);
+  fprintf(sourceFile, "/* Rasterized  = %5zu bytes (%d glyphs x %d pixels)\n", initialDataSize, GLYPH_COUNT, glyph_width*glyph_height);
+  fprintf(sourceFile, " * Downsampled = %5lu bytes (1/%d of rasterized)\n", initialDataSize*greyscaleBitsPerPixel/8, 8/greyscaleBitsPerPixel);
+  fprintf(sourceFile, " * Compressed  = %5zu bytes (%.2f%% of rasterized) */\n", finalDataSize, 100.0*finalDataSize/initialDataSize);
 
   fprintf(sourceFile, "static constexpr uint8_t glyphData[%d] = {", lastOffset);
   prettyPrintArray(sourceFile, 80, 1, glyphData, lastOffset);
diff --git a/kandinsky/src/font.cpp b/kandinsky/src/font.cpp
index 907356d12..07ca8d4fd 100644
--- a/kandinsky/src/font.cpp
+++ b/kandinsky/src/font.cpp
@@ -31,6 +31,7 @@ void KDFont::fetchGreyscaleGlyphForChar(char c, uint8_t * greyscaleBuffer) const
     compressedGlyphDataSize(c),
     m_glyphSize.width() * m_glyphSize.height() * k_bitsPerPixel/8
   );
+  (void)resultSize; // Silence the "variable unused" warning if assertions are not enabled
   assert(resultSize == m_glyphSize.width() * m_glyphSize.height() * k_bitsPerPixel/8);
 }