diff --git a/JFMC_BadPixels.cpp b/JFMC_BadPixels.cpp
index 4d079ea..84a31ca 100644
--- a/JFMC_BadPixels.cpp
+++ b/JFMC_BadPixels.cpp
@@ -4,6 +4,7 @@
 #include "../sls_detector_calibration/jungfrauCommonFunctions.h"
 
 #include <fstream>
+#include <dirent.h>
 
 #include "TCanvas.h"
 #include "TFile.h"
@@ -30,14 +31,12 @@ int main(int argc, char* argv[]) {
 
   for (int j = 0; j < 300; j++) {
 
-    // first check if a gain map exists
-    fstream infile;
-    sprintf(savename,"data/M%3.3d/gainMaps_M%3.3d.bin", j, j);
-    infile.open((char*)savename, ios::in | ios::binary);
-    if (not infile.is_open()) {
+    // check if directory exists
+    sprintf(savename,"data/M%3.3d", j);    
+    DIR* dir = opendir(savename);
+    if (not dir) {
       continue;
     }
-    infile.close();
 
     int this_hg0_missing = 0;
     int this_hg0_crazy = 0;