diff --git a/src/util/bear.rs b/src/util/bear.rs
index 5383d84..c524520 100644
--- a/src/util/bear.rs
+++ b/src/util/bear.rs
@@ -4,6 +4,7 @@ use std::iter::Peekable;
 use std::str::Chars;
 
 use crate::core::*;
+use crate::util::validate::{ResultBuilder, Validate};
 
 const MAX_PARAM_LEN: usize = 16384;
 
@@ -133,6 +134,14 @@ impl<'de> de::Visitor<'de> for BearcapVisitor {
     }
 }
 
+impl Validate for Bearcap {
+    fn validate(&self, builder: ResultBuilder) -> ResultBuilder {
+        builder.field(&self.url, "url", |f| {
+            f.check("URL must start with https://", |v| v.starts_with("https://"))
+        })
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::util::bear::Bearcap;