diff --git a/src/passbook-vuln-1.c b/src/passbook-vuln-1.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook-vuln-1.c
+++ b/src/passbook-vuln-1.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif
diff --git a/src/passbook-vuln-2.c b/src/passbook-vuln-2.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook-vuln-2.c
+++ b/src/passbook-vuln-2.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif
diff --git a/src/passbook-vuln-3.c b/src/passbook-vuln-3.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook-vuln-3.c
+++ b/src/passbook-vuln-3.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif
diff --git a/src/passbook-vuln-4.c b/src/passbook-vuln-4.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook-vuln-4.c
+++ b/src/passbook-vuln-4.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif
diff --git a/src/passbook-vuln-5.c b/src/passbook-vuln-5.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook-vuln-5.c
+++ b/src/passbook-vuln-5.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif
diff --git a/src/passbook.c b/src/passbook.c
index 9a6227d2a70019f1f06a45fe65ca963be8dc2d16..2a2ae56b90e1190bb5c4f554e48fa41c928ab935 100644
--- a/src/passbook.c
+++ b/src/passbook.c
@@ -364,7 +364,7 @@ int save_levelorder(const node_t *p, const char *masterpw,
                     const char * filename){
 #ifdef PASSBOOK_FUZZ
   // ignore the file name when fuzzing etc. to avoid DoS on the server
-  FILE *f = fopen(".passbook_fuzz_save_file","w");
+  FILE *f = fopen("/dev/null","w");
 #else
   FILE *f = fopen(filename,"w");
 #endif