diff --git a/src/analyzer/Tag.cc b/src/analyzer/Tag.cc
index 3ab41daf78..128449175e 100644
--- a/src/analyzer/Tag.cc
+++ b/src/analyzer/Tag.cc
@@ -3,7 +3,7 @@
 #include "Tag.h"
 #include "Manager.h"
 
-analyzer::Tag analyzer::Tag::Error;
+const analyzer::Tag analyzer::Tag::Error;
 
 analyzer::Tag::Tag(type_t type, subtype_t subtype)
 	: ::Tag(analyzer_mgr->GetTagEnumType(), type, subtype)
diff --git a/src/analyzer/Tag.h b/src/analyzer/Tag.h
index d45501070b..2e9343da61 100644
--- a/src/analyzer/Tag.h
+++ b/src/analyzer/Tag.h
@@ -82,7 +82,7 @@ public:
 	 */
 	EnumVal* AsEnumVal() const;
 
-	static Tag Error;
+	static const Tag Error;
 
 protected:
 	friend class analyzer::Manager;
diff --git a/src/file_analysis/Tag.cc b/src/file_analysis/Tag.cc
index 6f0774a4b4..30958ed605 100644
--- a/src/file_analysis/Tag.cc
+++ b/src/file_analysis/Tag.cc
@@ -5,7 +5,7 @@
 
 using namespace file_analysis;
 
-file_analysis::Tag file_analysis::Tag::Error;
+const file_analysis::Tag file_analysis::Tag::Error;
 
 file_analysis::Tag::Tag(type_t type, subtype_t subtype)
 	: ::Tag(file_mgr->GetTagEnumType(), type, subtype)
diff --git a/src/file_analysis/Tag.h b/src/file_analysis/Tag.h
index 9e35251461..d53c8d6a16 100644
--- a/src/file_analysis/Tag.h
+++ b/src/file_analysis/Tag.h
@@ -81,7 +81,7 @@ public:
 	 */
 	EnumVal* AsEnumVal() const;
 
-	static Tag Error;
+	static const Tag Error;
 
 protected:
 	friend class plugin::ComponentManager<Tag, Component>;
diff --git a/src/input/Tag.cc b/src/input/Tag.cc
index 4f227f7799..a2c0708583 100644
--- a/src/input/Tag.cc
+++ b/src/input/Tag.cc
@@ -3,7 +3,7 @@
 #include "Tag.h"
 #include "Manager.h"
 
-input::Tag input::Tag::Error;
+const input::Tag input::Tag::Error;
 
 input::Tag::Tag(type_t type, subtype_t subtype)
 	: ::Tag(input_mgr->GetTagEnumType(), type, subtype)
diff --git a/src/input/Tag.h b/src/input/Tag.h
index 2d7217afb0..625b57041f 100644
--- a/src/input/Tag.h
+++ b/src/input/Tag.h
@@ -82,7 +82,7 @@ public:
 	 */
 	EnumVal* AsEnumVal() const;
 
-	static Tag Error;
+	static const Tag Error;
 
 protected:
 	friend class plugin::ComponentManager<Tag, Component>;
diff --git a/src/logging/Tag.cc b/src/logging/Tag.cc
index dea3b41819..f6e7f89c4c 100644
--- a/src/logging/Tag.cc
+++ b/src/logging/Tag.cc
@@ -3,7 +3,7 @@
 #include "Tag.h"
 #include "Manager.h"
 
-logging::Tag logging::Tag::Error;
+const logging::Tag logging::Tag::Error;
 
 logging::Tag::Tag(type_t type, subtype_t subtype)
 	: ::Tag(log_mgr->GetTagEnumType(), type, subtype)
diff --git a/src/logging/Tag.h b/src/logging/Tag.h
index c44fd2831b..8357aee663 100644
--- a/src/logging/Tag.h
+++ b/src/logging/Tag.h
@@ -82,7 +82,7 @@ public:
 	 */
 	EnumVal* AsEnumVal() const;
 
-	static Tag Error;
+	static const Tag Error;
 
 protected:
 	friend class plugin::ComponentManager<Tag, Component>;