diff --git a/Sources/Generator/Processing/GenerationResultsHandler.swift b/Sources/Generator/Processing/GenerationResultsHandler.swift
index c0e6584..d09a472 100644
--- a/Sources/Generator/Processing/GenerationResultsHandler.swift
+++ b/Sources/Generator/Processing/GenerationResultsHandler.swift
@@ -338,7 +338,7 @@ final class GenerationResultsHandler {
     }
 
     private func markImageAsMissing(path: String, source: String) {
-        images.missing[source] = path
+        images.missing[path] = source
     }
 
     private func requireImage(at destination: String, generatedFrom source: String, requiredBy path: String, quality: Float, width: Int, height: Int?, alwaysGenerate: Bool) -> NSSize {