diff --git a/cc/fuzz.go b/cc/fuzz.go
index bb89bb4..c2b0ff4 100644
--- a/cc/fuzz.go
+++ b/cc/fuzz.go
@@ -345,6 +345,11 @@
 			return
 		}
 
+		// Discard modules that are in an unavailable namespace.
+		if !ccModule.ExportedToMake() {
+			return
+		}
+
 		s.fuzzTargets[module.Name()] = true
 
 		hostOrTargetString := "target"