diff --git a/lib/assert.js b/lib/assert.js
index 17291f4..12dc9cc 100644
--- a/lib/assert.js
+++ b/lib/assert.js
@@ -16,6 +16,7 @@ class AssertionError extends Error {
 		this.name = 'AssertionError';
 
 		this.assertion = opts.assertion;
+		this.fixedSource = opts.fixedSource;
 		this.operator = opts.operator;
 		this.values = opts.values || [];
 
diff --git a/lib/serialize-error.js b/lib/serialize-error.js
index a0053ac..2d2fe00 100644
--- a/lib/serialize-error.js
+++ b/lib/serialize-error.js
@@ -15,13 +15,15 @@ function filter(propertyName, isRoot) {
 }
 
 const stackUtils = new StackUtils();
-function buildSource(stack) {
+function extractSource(stack) {
 	if (!stack) {
 		return null;
 	}
 
 	const firstStackLine = extractStack(stack).split('\n')[0];
-	const source = stackUtils.parseLine(firstStackLine);
+	return stackUtils.parseLine(firstStackLine);
+}
+function buildSource(source) {
 	if (!source) {
 		return null;
 	}
@@ -49,10 +51,10 @@ module.exports = error => {
 	const stack = typeof error.stack === 'string' ?
 		beautifyStack(error.stack) :
 		null;
-	const source = buildSource(stack);
+
 	const retval = {
 		avaAssertionError: isAvaAssertionError(error),
-		source
+		source: buildSource(extractSource(stack))
 	};
 	if (stack) {
 		retval.stack = stack;
@@ -64,6 +66,13 @@ module.exports = error => {
 		retval.statements = error.statements;
 		retval.values = error.values;
 
+		if (error.fixedSource) {
+			const source = buildSource(error.fixedSource);
+			if (source) {
+				retval.source = source;
+			}
+		}
+
 		if (error.assertion) {
 			retval.assertion = error.assertion;
 		}