diff --git a/Source/cmExportPackageInfoGenerator.cxx b/Source/cmExportPackageInfoGenerator.cxx
index f2fbc280bf..b61d6a4f52 100644
--- a/Source/cmExportPackageInfoGenerator.cxx
+++ b/Source/cmExportPackageInfoGenerator.cxx
@@ -305,7 +305,8 @@ bool cmExportPackageInfoGenerator::NoteLinkedTarget(
         cmStrCat("Target \"", target->GetName(), "\" references target \"",
                  linkedName, "\", which comes from the \"", pkgName,
                  "\" package, but does not belong to the package's "
-                 "canonical namespace. This is not allowed."));
+                 "canonical namespace (\"",
+                 prefix, "\"). This is not allowed."));
       return false;
     }
 
diff --git a/Tests/RunCMake/ExportPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt b/Tests/RunCMake/ExportPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
index 0a6872e32d..74f771c215 100644
--- a/Tests/RunCMake/ExportPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
+++ b/Tests/RunCMake/ExportPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
@@ -1,4 +1,4 @@
-CMake Error in CMakeLists.txt:
+CMake Error in CMakeLists\.txt:
   Target "foo" references target "wrong::lib", which comes from the "broken"
-  package, but does not belong to the package's canonical namespace.  This is
-  not allowed.
+  package, but does not belong to the package's canonical namespace
+  \("broken::"\)\.  This is not allowed\.
diff --git a/Tests/RunCMake/InstallPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt b/Tests/RunCMake/InstallPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
index 0a6872e32d..74f771c215 100644
--- a/Tests/RunCMake/InstallPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
+++ b/Tests/RunCMake/InstallPackageInfo/ReferencesWronglyNamespacedTarget-stderr.txt
@@ -1,4 +1,4 @@
-CMake Error in CMakeLists.txt:
+CMake Error in CMakeLists\.txt:
   Target "foo" references target "wrong::lib", which comes from the "broken"
-  package, but does not belong to the package's canonical namespace.  This is
-  not allowed.
+  package, but does not belong to the package's canonical namespace
+  \("broken::"\)\.  This is not allowed\.