diff --git a/base/src/main/java/proguard/util/kotlin/asserter/constraint/KotlinModuleIntegrity.java b/base/src/main/java/proguard/util/kotlin/asserter/constraint/KotlinModuleIntegrity.java
index b37866aae..e6d9c597f 100644
--- a/base/src/main/java/proguard/util/kotlin/asserter/constraint/KotlinModuleIntegrity.java
+++ b/base/src/main/java/proguard/util/kotlin/asserter/constraint/KotlinModuleIntegrity.java
@@ -126,6 +126,9 @@ public void visitKotlinModule(KotlinModule kotlinModule) {
                 if (mfp != null) {
                   util.reportIfNull(
                       "referenced multi-file part for '" + mfpName + "'", mfp.ownerReferencedClass);
+                  util.reportIfNull(
+                      "referenced multi-file part for '" + mfpName + "'",
+                      mfp.referencedFacadeClass);
                 }
               });
         });