diff --git a/Sources/SourceGraph/Mutators/ResultBuilderRetainer.swift b/Sources/SourceGraph/Mutators/ResultBuilderRetainer.swift
index cf31655ff..70bbf7f03 100644
--- a/Sources/SourceGraph/Mutators/ResultBuilderRetainer.swift
+++ b/Sources/SourceGraph/Mutators/ResultBuilderRetainer.swift
@@ -14,6 +14,8 @@ final class ResultBuilderRetainer: SourceGraphMutator {
         "buildBlock(_:)",
         "buildFinalResult(_:)",
         "buildLimitedAvailability(_:)",
+        "buildPartialBlock(first:)",
+        "buildPartialBlock(accumulated:next:)",
     ])
 
     required init(graph: SourceGraph, configuration _: Configuration, swiftVersion _: SwiftVersion) {
diff --git a/Tests/Fixtures/Sources/RetentionFixtures/testRetainsResultBuilderMethods.swift b/Tests/Fixtures/Sources/RetentionFixtures/testRetainsResultBuilderMethods.swift
index 4af7dfd11..d2689f4a8 100644
--- a/Tests/Fixtures/Sources/RetentionFixtures/testRetainsResultBuilderMethods.swift
+++ b/Tests/Fixtures/Sources/RetentionFixtures/testRetainsResultBuilderMethods.swift
@@ -37,6 +37,14 @@ class FixtureClass130 {
     static func buildLimitedAvailability(_ component: Component) -> Component {
         component
     }
+
+    static func buildPartialBlock(first: Component) -> Component {
+        first
+    }
+
+    static func buildPartialBlock(accumulated: Component, next: Component) -> Component {
+        accumulated + next
+    }
 }
 
 public class FixtureClass130Retainer {
diff --git a/Tests/PeripheryTests/RetentionTest.swift b/Tests/PeripheryTests/RetentionTest.swift
index 599bb83ec..8fb7a07dc 100644
--- a/Tests/PeripheryTests/RetentionTest.swift
+++ b/Tests/PeripheryTests/RetentionTest.swift
@@ -916,6 +916,8 @@ final class RetentionTest: FixtureSourceGraphTestCase {
                 self.assertReferenced(.functionMethodStatic("buildBlock(_:)"))
                 self.assertReferenced(.functionMethodStatic("buildFinalResult(_:)"))
                 self.assertReferenced(.functionMethodStatic("buildLimitedAvailability(_:)"))
+                self.assertReferenced(.functionMethodStatic("buildPartialBlock(first:)"))
+                self.assertReferenced(.functionMethodStatic("buildPartialBlock(accumulated:next:)"))
             }
         }
     }