diff --git a/src/capture_tls.c b/src/capture_tls.c
index 234f68e4..a350d611 100644
--- a/src/capture_tls.c
+++ b/src/capture_tls.c
@@ -170,19 +170,19 @@ tls_check_keyfile(const char *keyfile)
     OpenSSL_add_all_algorithms();
 
     if (access(capture_get_keyfile(), R_OK) != 0)
-        return false;
+        return 0;
 
     if (!(ssl_ctx = SSL_CTX_new(SSLv23_server_method())))
-        return false;
+        return 0;
 
     SSL_CTX_use_PrivateKey_file(ssl_ctx, capture_get_keyfile(), SSL_FILETYPE_PEM);
     if (!(ssl = SSL_new(ssl_ctx)))
-        return false;
+        return 0;
 
     if (!SSL_get_privatekey(ssl))
-        return false;
+        return 0;
 
-    return true;
+    return 1;
 }
 
 int
diff --git a/src/capture_tls.h b/src/capture_tls.h
index b3fbc278..1a5b849c 100644
--- a/src/capture_tls.h
+++ b/src/capture_tls.h
@@ -309,7 +309,7 @@ tls_connection_destroy(struct SSLConnection *conn);
  * This can be used to check if a file contains valid RSA data
  *
  * @param keyfile Absolute path the keyfile
- * @return true if file contains RSA private info, false otherwise
+ * @return 1 if file contains RSA private info, 0 otherwise
  */
 int
 tls_check_keyfile(const char *keyfile);
diff --git a/src/ui_call_flow.c b/src/ui_call_flow.c
index 886aed08..60c18ea6 100644
--- a/src/ui_call_flow.c
+++ b/src/ui_call_flow.c
@@ -188,7 +188,7 @@ call_flow_draw(PANEL *panel)
 
     // Draw the scrollbar
     draw_vscrollbar(info->flow_win, call_group_msg_number(info->group, info->first_msg) * 2,
-                    call_group_msg_count(info->group) * 2, true);
+                    call_group_msg_count(info->group) * 2, 1);
 
     // Redraw flow win
     wnoutrefresh(info->flow_win);
diff --git a/src/ui_call_list.c b/src/ui_call_list.c
index 9e1031dd..ea60949a 100644
--- a/src/ui_call_list.c
+++ b/src/ui_call_list.c
@@ -102,7 +102,7 @@ call_list_create()
     info->form = new_form(info->fields);
     set_form_sub(info->form, win);
     // Form starts inactive
-    call_list_form_activate(panel, false);
+    call_list_form_activate(panel, 0);
 
     // Calculate available printable area
     info->list_win = subwin(win, height - 5, width, 4, 0);
@@ -122,7 +122,7 @@ call_list_create()
     // Set defualt filter text if configured
     if (get_option_value("cl.filter")) {
         set_field_buffer(info->fields[FLD_LIST_FILTER], 0, get_option_value("cl.filter"));
-        call_list_form_activate(panel, false);
+        call_list_form_activate(panel, 0);
     }
 
     // Return the created panel
@@ -294,7 +294,7 @@ call_list_draw(PANEL *panel)
     }
 
     // Draw scrollbar to the right
-    draw_vscrollbar(win, info->first_line, dispcallcnt, true);
+    draw_vscrollbar(win, info->first_line, dispcallcnt, 1);
     wnoutrefresh(info->list_win);
 
     return 0;
@@ -408,7 +408,7 @@ call_list_handle_key(PANEL *panel, int key)
         case 9 /*KEY_TAB*/:
         case KEY_F(3):
             // Activate Form
-            call_list_form_activate(panel, true);
+            call_list_form_activate(panel, 1);
             break;
         case KEY_DOWN:
             // Check if there is a call below us
@@ -578,7 +578,7 @@ call_list_handle_form_key(PANEL *panel, int key)
         case KEY_DOWN:
         case KEY_UP:
             // Activate list
-            call_list_form_activate(panel, false);
+            call_list_form_activate(panel, 0);
             break;
         case KEY_RIGHT:
             form_driver(info->form, REQ_RIGHT_CHAR);