diff --git a/src/analysis/comma_expression.d b/src/analysis/comma_expression.d
index d4f241d..626eab8 100644
--- a/src/analysis/comma_expression.d
+++ b/src/analysis/comma_expression.d
@@ -46,5 +46,5 @@ class CommaExpressionCheck : BaseAnalyzer
 
 	int interest;
 
-	private enum KEY = "dscanner.suspicious.comma_expression";
+	private enum string KEY = "dscanner.suspicious.comma_expression";
 }
diff --git a/src/analysis/function_attributes.d b/src/analysis/function_attributes.d
index 70d2b11..1ef5d50 100644
--- a/src/analysis/function_attributes.d
+++ b/src/analysis/function_attributes.d
@@ -114,8 +114,8 @@ class FunctionAttributeCheck : BaseAnalyzer
 		dec.accept(this);
 	}
 
+private:
 	bool inInterface;
-
-	private enum ABSTRACT_MESSAGE = "'abstract' attribute is redundant in interface declarations";
-	private enum KEY = "dscanner.confusing.function_attributes";
+	enum string ABSTRACT_MESSAGE = "'abstract' attribute is redundant in interface declarations";
+	enum string KEY = "dscanner.confusing.function_attributes";
 }
diff --git a/src/analysis/if_statements.d b/src/analysis/if_statements.d
index c883de3..4c6ba36 100644
--- a/src/analysis/if_statements.d
+++ b/src/analysis/if_statements.d
@@ -109,7 +109,7 @@ private:
 	bool inIfExpresson;
 	int depth;
 	ExpressionInfo[] expressions;
-	private enum KEY = "dscanner.if_statement";
+	enum string KEY = "dscanner.if_statement";
 }
 
 private struct ExpressionInfo
diff --git a/src/analysis/incorrect_infinite_range.d b/src/analysis/incorrect_infinite_range.d
index 8bf08c8..9e808e6 100644
--- a/src/analysis/incorrect_infinite_range.d
+++ b/src/analysis/incorrect_infinite_range.d
@@ -79,8 +79,8 @@ class IncorrectInfiniteRangeCheck : BaseAnalyzer
 
 private:
 	uint inStruct;
-	enum KEY = "dscanner.suspicios.incorrect_infinite_range";
-	enum MESSAGE = "Use `enum bool empty = false;` to define an infinite range.";
+	enum string KEY = "dscanner.suspicios.incorrect_infinite_range";
+	enum string MESSAGE = "Use `enum bool empty = false;` to define an infinite range.";
 	size_t line;
 	size_t column;
 }
diff --git a/src/analysis/mismatched_args.d b/src/analysis/mismatched_args.d
index 8ad3d14..fbc0c28 100644
--- a/src/analysis/mismatched_args.d
+++ b/src/analysis/mismatched_args.d
@@ -70,7 +70,7 @@ final class MismatchedArgumentCheck : BaseAnalyzer
 
 private:
 
-	enum KEY = "dscanner.confusing.argument_parameter_mismatch";
+	enum string KEY = "dscanner.confusing.argument_parameter_mismatch";
 }
 
 final class IdentVisitor : ASTVisitor
diff --git a/src/analysis/redundant_parens.d b/src/analysis/redundant_parens.d
index dffc01c..0c53248 100644
--- a/src/analysis/redundant_parens.d
+++ b/src/analysis/redundant_parens.d
@@ -60,5 +60,5 @@ class RedundantParenCheck : BaseAnalyzer
 	}
 
 private:
-	enum KEY = "dscanner.suspicious.redundant_parens";
+	enum string KEY = "dscanner.suspicious.redundant_parens";
 }