diff --git a/modules/imgcodecs/src/grfmt_png.cpp b/modules/imgcodecs/src/grfmt_png.cpp
index e75f0bf45f..5b33c66484 100644
--- a/modules/imgcodecs/src/grfmt_png.cpp
+++ b/modules/imgcodecs/src/grfmt_png.cpp
@@ -266,7 +266,7 @@ bool  PngDecoder::readData( Mat& img )
             if( m_color_type == PNG_COLOR_TYPE_PALETTE )
                 png_set_palette_to_rgb( png_ptr );
 
-            if( (m_color_type & PNG_COLOR_MASK_COLOR) != 0 && m_bit_depth < 8 )
+            if( (m_color_type & PNG_COLOR_MASK_COLOR) == 0 && m_bit_depth < 8 )
 #if (PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE >= 10209) || \
     (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR == 0 && PNG_LIBPNG_VER_RELEASE >= 18)
                 png_set_expand_gray_1_2_4_to_8( png_ptr );