diff --git a/client/cmdhficlass.c b/client/cmdhficlass.c
index c25bebdd3..ed73a98cc 100644
--- a/client/cmdhficlass.c
+++ b/client/cmdhficlass.c
@@ -636,7 +636,7 @@ int CmdHFiClassELoad(const char *Cmd) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogDevice(WARNING, "error, when getting filesize");
         fclose(f);
         return 1;
@@ -729,7 +729,7 @@ int CmdHFiClassDecrypt(const char *Cmd) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogEx(WARNING, "error, when getting filesize");
         fclose(f);
         return 2;
@@ -1609,7 +1609,7 @@ int CmdHFiClassReadTagFile(const char *Cmd) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogEx(WARNING, "Error, when getting filesize");
         fclose(f);
         return 1;
@@ -1766,7 +1766,7 @@ static int loadKeys(char *filename) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogEx(WARNING, "Error, when getting filesize");
         fclose(f);
         return 1;
diff --git a/client/cmdhfmfu.c b/client/cmdhfmfu.c
index f20665df6..45c67bcb3 100644
--- a/client/cmdhfmfu.c
+++ b/client/cmdhfmfu.c
@@ -2076,7 +2076,7 @@ int CmdHF14AMfURestore(const char *Cmd) {
     fseek(f, 0, SEEK_END);
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogEx(WARNING, "Error, when getting filesize");
         fclose(f);
         return 1;
diff --git a/client/cmdsmartcard.c b/client/cmdsmartcard.c
index b1c3c3797..a930d3be5 100644
--- a/client/cmdsmartcard.c
+++ b/client/cmdsmartcard.c
@@ -645,7 +645,7 @@ int CmdSmartUpgrade(const char *Cmd) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogEx(WARNING, "error, when getting filesize");
         fclose(f);
         return 1;
@@ -676,7 +676,7 @@ int CmdSmartUpgrade(const char *Cmd) {
     fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0)  {
+    if (fsize < 0) {
         PrintAndLogEx(FAILED, "Could not determine size of SHA-512 file");
         fclose(f);
         free(dump);
diff --git a/client/loclass/elite_crack.c b/client/loclass/elite_crack.c
index 038d8e475..5a280e7c1 100644
--- a/client/loclass/elite_crack.c
+++ b/client/loclass/elite_crack.c
@@ -539,7 +539,7 @@ int bruteforceFile(const char *filename, uint16_t keytable[]) {
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogDevice(WARNING, "Error, when getting filesize");
         fclose(f);
         return 1;
diff --git a/client/loclass/fileutils.c b/client/loclass/fileutils.c
index 4ac77633a..4bfe0129e 100644
--- a/client/loclass/fileutils.c
+++ b/client/loclass/fileutils.c
@@ -292,7 +292,7 @@ int loadFile(const char *preferredName, const char *suffix, void *data, size_t m
     long fsize = ftell(f);
     fseek(f, 0, SEEK_SET);
 
-    if (fsize < 0) {
+    if (fsize <= 0) {
         PrintAndLogDevice(FAILED, "error, when getting filesize");
         retval = 1;
         goto out;