diff --git a/Sources/XCLogParser/parser/ParserBuildSteps.swift b/Sources/XCLogParser/parser/ParserBuildSteps.swift
index cdea461..912c8bd 100644
--- a/Sources/XCLogParser/parser/ParserBuildSteps.swift
+++ b/Sources/XCLogParser/parser/ParserBuildSteps.swift
@@ -374,7 +374,8 @@ public final class ParserBuildSteps {
     private func addCompilationTimesToTarget(_ target: BuildStep) -> BuildStep {
 
         let lastCompilationStep = target.subSteps
-            .filter { $0.isCompilationStep() && $0.fetchedFromCache == false }
+            .filter { $0.isCompilationStep() && $0.fetchedFromCache == false &&
+                $0.compilationEndTimestamp >= target.startTimestamp }
             .max { $0.compilationEndTimestamp < $1.compilationEndTimestamp }
         guard let lastStep = lastCompilationStep else {
             return target.with(newCompilationEndTimestamp: target.startTimestamp, andCompilationDuration: 0.0)
@@ -385,7 +386,8 @@ public final class ParserBuildSteps {
 
     private func addCompilationTimesToApp(_ app: BuildStep) -> BuildStep {
         let lastCompilationStep = app.subSteps
-            .filter { $0.compilationDuration > 0 && $0.fetchedFromCache == false }
+            .filter { $0.compilationDuration > 0 && $0.fetchedFromCache == false &&
+                $0.compilationEndTimestamp >= app.startTimestamp }
             .max { $0.compilationEndTimestamp < $1.compilationEndTimestamp }
         guard let lastStep = lastCompilationStep else {
             return app.with(newCompilationEndTimestamp: app.startTimestamp,
diff --git a/Tests/XCLogParserTests/ParserTests.swift b/Tests/XCLogParserTests/ParserTests.swift
index a0e978a..5c01c54 100644
--- a/Tests/XCLogParserTests/ParserTests.swift
+++ b/Tests/XCLogParserTests/ParserTests.swift
@@ -346,6 +346,31 @@ note: use 'updatedDoSomething' instead\r doSomething()\r        ^~~~~~~~~~~\r
         XCTAssertEqual(expectedCompilationDuration, targetStep.compilationDuration)
     }
 
+    func testParseTargetCompilationTimesIgnoresStaleSubsteps() {
+        // For incremental builds, Xcode reuses substep entries from previous build sessions for
+        // files that didn't need recompilation. Those substeps keep their original (older)
+        // timestamps and are not flagged `wasFetchedFromCache`. The target's compilationDuration
+        // must remain non-negative; substeps that ended before the target started belong to a
+        // prior session and should be ignored.
+        let now = Date().timeIntervalSince1970
+        let staleCompileEnd = now - 1000
+        let staleStep = makeFakeBuildStep(title: "Stale Compile",
+                                          type: .detail,
+                                          detailStepType: .cCompilation,
+                                          startTimestamp: now - 1010,
+                                          fetchedFromCache: false)
+            .with(newCompilationEndTimestamp: staleCompileEnd, andCompilationDuration: 10)
+        var targetStep = makeFakeBuildStep(title: "Build Target",
+                                           type: .target,
+                                           detailStepType: .none,
+                                           startTimestamp: now,
+                                           fetchedFromCache: false).with(subSteps: [staleStep])
+
+        targetStep = parser.addCompilationTimes(step: targetStep)
+        XCTAssertEqual(targetStep.startTimestamp, targetStep.compilationEndTimestamp)
+        XCTAssertEqual(0.0, targetStep.compilationDuration)
+    }
+
     func testParseAppCompilationTimes() {
         let expectedCompilationDuration = 50.0
         let now = Date().timeIntervalSince1970