diff --git a/src/google_breakpad/processor/minidump.h b/src/google_breakpad/processor/minidump.h
index c6273cff..968cd8de 100644
--- a/src/google_breakpad/processor/minidump.h
+++ b/src/google_breakpad/processor/minidump.h
@@ -892,7 +892,7 @@ class MinidumpLinuxMaps : public MinidumpObject {
   const string GetPathname() const { return valid_ ? region_.path : ""; }
 
   // Print the contents of this mapping.
-  void Print();
+  void Print() const;
 
  private:
   // These objects are managed by MinidumpLinuxMapsList.
@@ -920,7 +920,7 @@ class MinidumpLinuxMapsList : public MinidumpStream {
   const MinidumpLinuxMaps *GetLinuxMapsAtIndex(unsigned int index) const;
 
   // Print the contents of /proc/self/maps to stdout.
-  void Print();
+  void Print() const;
 
  private:
   friend class Minidump;
diff --git a/src/processor/minidump.cc b/src/processor/minidump.cc
index 02aa16b6..85ec6b9c 100644
--- a/src/processor/minidump.cc
+++ b/src/processor/minidump.cc
@@ -3999,7 +3999,7 @@ MinidumpLinuxMaps::MinidumpLinuxMaps(Minidump *minidump)
     : MinidumpObject(minidump) {
 }
 
-void MinidumpLinuxMaps::Print() {
+void MinidumpLinuxMaps::Print() const {
   if (!valid_) {
     BPLOG(ERROR) << "MinidumpLinuxMaps cannot print invalid data";
     return;
@@ -4125,7 +4125,7 @@ bool MinidumpLinuxMapsList::Read(uint32_t expected_size) {
   return true;
 }
 
-void MinidumpLinuxMapsList::Print() {
+void MinidumpLinuxMapsList::Print() const {
   if (!valid_ || (maps_ == NULL)) {
     BPLOG(ERROR) << "MinidumpLinuxMapsList cannot print valid data";
     return;