diff --git a/lib/src/analysis/analyzer.rs b/lib/src/analysis/analyzer.rs
index 55380f8..08a35a2 100644
--- a/lib/src/analysis/analyzer.rs
+++ b/lib/src/analysis/analyzer.rs
@@ -110,6 +110,12 @@ pub struct Harness {
     analyzers: Vec<Box<dyn Analyzer + Send>>,
 }
 
+impl Default for Harness {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Harness {
     pub fn new() -> Self {
         Self { analyzers: Vec::new() }
diff --git a/lib/src/analysis/imsi_requested.rs b/lib/src/analysis/imsi_requested.rs
index f78b348..323f926 100644
--- a/lib/src/analysis/imsi_requested.rs
+++ b/lib/src/analysis/imsi_requested.rs
@@ -9,6 +9,12 @@ pub struct ImsiRequestedAnalyzer {
     packet_num: usize,
 }
 
+impl Default for ImsiRequestedAnalyzer {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl ImsiRequestedAnalyzer {
     pub fn new() -> Self {
         Self { packet_num: 0 }
diff --git a/lib/src/util.rs b/lib/src/util.rs
index aa153fe..5d719ea 100644
--- a/lib/src/util.rs
+++ b/lib/src/util.rs
@@ -12,6 +12,12 @@ pub struct RuntimeMetadata {
     pub arch: String,
 }
 
+impl Default for RuntimeMetadata {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl RuntimeMetadata {
     /// Return the binary and system information, attempting to retrieve
     /// attributes from `uname(2)` and falling back to values from