diff --git a/src/http/Client.zig b/src/http/Client.zig
index 4487f9a6..c5571c13 100644
--- a/src/http/Client.zig
+++ b/src/http/Client.zig
@@ -338,6 +338,8 @@ pub fn restoreOriginalProxy(self: *Client) !void {
 
 // Enable TLS verification on all connections.
 pub fn enableTlsVerify(self: *const Client) !void {
+    try self.ensureNoActiveConnection();
+
     for (self.handles.handles) |*h| {
         const easy = h.conn.easy;
 
@@ -353,6 +355,8 @@ pub fn enableTlsVerify(self: *const Client) !void {
 
 // Disable TLS verification on all connections.
 pub fn disableTlsVerify(self: *const Client) !void {
+    try self.ensureNoActiveConnection();
+
     for (self.handles.handles) |*h| {
         const easy = h.conn.easy;