diff --git a/misc/safreader.cpp b/misc/safreader.cpp
index c484bf4..cc4e39d 100644
--- a/misc/safreader.cpp
+++ b/misc/safreader.cpp
@@ -61,7 +61,7 @@ int safversion(const char *fname)
   gz = gzopen(fname,"r");
   if(gz==Z_NULL){
     fprintf(stderr,"\t-> Problem opening file: \'%s\'",fname);
-    exit(0);
+    exit(EXIT_FAILURE);
   }
   char buf[8];
   gzread(gz,buf,8*sizeof(char));
@@ -92,14 +92,14 @@ persaf * persaf_init(char *fname, int verbose)
   size_t clen;
   if(!fexists(fname)){
     fprintf(stderr, "[persaf::persaf_init] Problem opening file: \'%s\'\n", fname);
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 
   FILE *fp = NULL;
   fp=fopen(fname,"r");
   if(fp==NULL){
     fprintf(stderr, "[persaf::persaf_init] Problem opening file: \'%s\'\n", fname);
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 
   char buf[8];
@@ -110,12 +110,12 @@ persaf * persaf_init(char *fname, int verbose)
     fprintf(stderr, "[persaf::persaf_init] Version of %s is %d\n", fname, ret->version);
   if(!(ret->version==2 || ret->version==3)){
     fprintf(stderr,"[persaf::persaf_init] You are using a version of realSFS that is incompatible with the old binary output from ANGSD. Please recreate the SAF files.\n");
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 
   if(1!=fread(&ret->nChr,sizeof(size_t),1,fp)){
     fprintf(stderr,"[%s.%s():%d] Problem reading data: %s \n",__FILE__,__FUNCTION__,__LINE__,fname);
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 
   ret->nSites = 0;
@@ -173,13 +173,13 @@ persaf * persaf_init(char *fname, int verbose)
   ret->saf = bgzf_open(tmp2,"r");
   if(!ret->saf){
     fprintf(stderr,"[persaf::persaf_init] Problem opening file \'%s\', will exit.\n",tmp2);
-    exit(0);
+    exit(EXIT_FAILURE);
   }
   if(ret->saf)
     my_bgzf_seek(ret->saf,8,SEEK_SET);
   if(ret->saf && ret->version!=safversion(tmp2)){
     fprintf(stderr,"[persaf::persaf_init] Version mismatch between %s and %s (%d and %d)\n",fname,tmp2,ret->version,safversion(tmp2));
-    exit(0);
+    exit(EXIT_FAILURE);
   }
 
   snprintf(tmp2,strlen(fname)+100,"%spos.gz",tmp);