diff --git a/ptxdist/local_src/ecu01-comp-cap/mmc_imp.c b/ptxdist/local_src/ecu01-comp-cap/mmc_imp.c
index 42d913d..187afe4 100644
--- a/ptxdist/local_src/ecu01-comp-cap/mmc_imp.c
+++ b/ptxdist/local_src/ecu01-comp-cap/mmc_imp.c
@@ -258,6 +258,8 @@ int qa_mmc_calc( struct qa_mmc_dev *dev )
       // if duration is longer than 100 ms the frequencey of pulses is less than 10 Hz.  This is an error
       if(l_periode_duartion > MAX_MMC_PERIODE_DELAY) i_mmc_error |= 0x8;
 
+      filtered_duration = 0;
+
       // Filter to eliminate values much longer than average or much shorter than everage.  
       // To prevent side effects activate filter only if L and R signal are not present
       // Interrupt from these signals should be preventet by disabling them if the bridge from Pin C3 to C4
@@ -298,7 +300,6 @@ int qa_mmc_calc( struct qa_mmc_dev *dev )
 
         ++filter_cnt;
 
-        filtered_duration = 0;
 
         for(i=0; i< 12; i++) {
           if((t_periode_duartion[i] > l_periode_duartion_min) && (t_periode_duartion[i] < l_periode_duartion_max)) {