diff --git a/source/App/EncoderApp/EncAppCfg.cpp b/source/App/EncoderApp/EncAppCfg.cpp
index 62ee368f2ef2c455dfb815939d8071e22e07c009..52d5c7341e34a26fb4b16bbcead5ef62f047a580 100644
--- a/source/App/EncoderApp/EncAppCfg.cpp
+++ b/source/App/EncoderApp/EncAppCfg.cpp
@@ -728,7 +728,7 @@ bool EncAppCfg::parseCfg( int argc, char* argv[] )
   SMultiValueInput<uint32_t>   cfg_FgcSEICompModelValueComp1              (0, 65535,  0, 256 * 6);
   SMultiValueInput<uint32_t>   cfg_FgcSEICompModelValueComp2              (0, 65535,  0, 256 * 6);
   SMultiValueInput<unsigned>   cfg_siiSEIInputNumUnitsInSI(0, std::numeric_limits<uint32_t>::max(), 0, 7);
-  SMultiValueInput<bool>       cfg_poSEIPrefixFlag(0, 1, 0, 256);
+  SMultiValueInput<bool>       cfg_poSEIPrefixFlag(false, true, 0, 256);
   SMultiValueInput<uint16_t>   cfg_poSEIPayloadType(0, 32768, 0, 256 * 2);
   SMultiValueInput<uint16_t>   cfg_poSEIProcessingOrder(0, 65535, 0, 65536);