diff --git a/vulnwhisp/frameworks/nessus.py b/vulnwhisp/frameworks/nessus.py
index 2292f52..64f3aa1 100755
--- a/vulnwhisp/frameworks/nessus.py
+++ b/vulnwhisp/frameworks/nessus.py
@@ -129,7 +129,7 @@ class NessusAPI(object):
 
     def get_scans(self, days=None):
         parameters = {}
-        if days:
+        if days != None:
             parameters = {
                 "last_modification_date": (datetime.now() - timedelta(days=days)).strftime("%s")
             }
diff --git a/vulnwhisp/frameworks/qualys_vm.py b/vulnwhisp/frameworks/qualys_vm.py
index 66c302d..82c880e 100644
--- a/vulnwhisp/frameworks/qualys_vm.py
+++ b/vulnwhisp/frameworks/qualys_vm.py
@@ -44,7 +44,7 @@ class qualysWhisperAPI(object):
         return pd.DataFrame(all_records)
 
     def get_all_scans(self, days=None):
-        if not days:
+        if days == None:
             self.launched_date = '0001-01-01'
         else:
             self.launched_date = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
diff --git a/vulnwhisp/frameworks/qualys_was.py b/vulnwhisp/frameworks/qualys_was.py
index f980653..0d71267 100644
--- a/vulnwhisp/frameworks/qualys_was.py
+++ b/vulnwhisp/frameworks/qualys_was.py
@@ -109,7 +109,7 @@ class qualysWhisperAPI(object):
 
 
     def get_all_scans(self, limit=1000, offset=1, status='FINISHED', days=None):
-        if not days:
+        if days == None:
             self.launched_date = '0001-01-01'
         else:
             self.launched_date = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')
diff --git a/vulnwhisp/vulnwhisp.py b/vulnwhisp/vulnwhisp.py
index 66e35fe..fdc454a 100755
--- a/vulnwhisp/vulnwhisp.py
+++ b/vulnwhisp/vulnwhisp.py
@@ -84,7 +84,7 @@ class vulnWhispererBase(object):
             self.logger.info('Filtering for scan names matching "{}"'.format(self.scan_filter))
             # self.scan_filter = re.compile(scan_filter)
 
-        if self.days:
+        if self.days != None:
             self.logger.info('Searching for scans within {} days'.format(self.days))
             # self.days = dp.parse(days)
             # self.logger.info('Searching for scans after {}'.format(self.days))