diff --git a/tools/opt/AnalysisWrappers.cpp b/tools/opt/AnalysisWrappers.cpp
index 2fe5d22..a2b57bb 100644
--- a/tools/opt/AnalysisWrappers.cpp
+++ b/tools/opt/AnalysisWrappers.cpp
@@ -66,12 +66,14 @@
       AU.setPreservesAll();
     }
   };
+}
 
-  char ExternalFunctionsPassedConstants::ID = 0;
-  RegisterPass<ExternalFunctionsPassedConstants>
+char ExternalFunctionsPassedConstants::ID = 0;
+static RegisterPass<ExternalFunctionsPassedConstants>
   P1("print-externalfnconstants",
      "Print external fn callsites passed constants");
 
+namespace {
   struct CallGraphPrinter : public ModulePass {
     static char ID; // Pass ID, replacement for typeid
     CallGraphPrinter() : ModulePass(ID) {}
@@ -85,8 +87,8 @@
       return false;
     }
   };
-
-  char CallGraphPrinter::ID = 0;
-  RegisterPass<CallGraphPrinter>
-    P2("print-callgraph", "Print a call graph");
 }
+
+char CallGraphPrinter::ID = 0;
+static RegisterPass<CallGraphPrinter>
+  P2("print-callgraph", "Print a call graph");
diff --git a/tools/opt/GraphPrinters.cpp b/tools/opt/GraphPrinters.cpp
index fa4339a..6a9e965 100644
--- a/tools/opt/GraphPrinters.cpp
+++ b/tools/opt/GraphPrinters.cpp
@@ -79,12 +79,12 @@
       AU.setPreservesAll();
     }
   };
-
-  char CallGraphPrinter::ID = 0;
-  RegisterPass<CallGraphPrinter> P2("dot-callgraph",
-                                    "Print Call Graph to 'dot' file");
 }
 
+char CallGraphPrinter::ID = 0;
+static RegisterPass<CallGraphPrinter> P2("dot-callgraph",
+                                         "Print Call Graph to 'dot' file");
+
 //===----------------------------------------------------------------------===//
 //                            DomInfoPrinter Pass
 //===----------------------------------------------------------------------===//
@@ -110,8 +110,8 @@
       return false;
     }
   };
-
-  char DomInfoPrinter::ID = 0;
-  static RegisterPass<DomInfoPrinter>
-  DIP("print-dom-info", "Dominator Info Printer", true, true);
 }
+
+char DomInfoPrinter::ID = 0;
+static RegisterPass<DomInfoPrinter>
+DIP("print-dom-info", "Dominator Info Printer", true, true);