diff --git a/macro/geometry/examine_materials.C b/macro/geometry/examine_materials.C
index 6b6a09ebff5feff161059920d599dcdb10cc298b..2e1457fac8ece69a14dbd19b4fd575c79c013372 100644
--- a/macro/geometry/examine_materials.C
+++ b/macro/geometry/examine_materials.C
@@ -24,7 +24,7 @@ typedef struct MAT_VOL mat_vol_t;
 
 struct MAT_VOL {
   int count;  // Number of volumes
-  char name[100];
+  char name[200];
 };
 
 int REG_MATERIALS = 0;  // counter for the currently number of registered materials.
@@ -65,7 +65,7 @@ int extract_mat_vol(char* fileName, mat_vol_t* material_array)
 
   file.GetListOfKeys()->Print();
   file.GetSize();
-  char geo_tag[100];
+  char geo_tag[300];
   strcpy(geo_tag, fileName);
   char* ptr = strstr(geo_tag, ".geo.root");
   *(ptr)    = '\0';
@@ -159,7 +159,7 @@ int examine_materials(const char* setup = "sis100_electron")
   printf("\n");
 
   TString fileName;
-  char fileNameC[100];
+  char fileNameC[300];
   CbmSetup* cs                  = run.GetSetup();
   mat_vol_t* detector_materials = (mat_vol_t*) malloc(sizeof(mat_vol_t) * 500);
   for (int i = 0; i < MAX_MATERIALS; i++) {