diff --git a/include/asm/rpn.hpp b/include/asm/rpn.hpp
index 4381ad9a..860241b7 100644
--- a/include/asm/rpn.hpp
+++ b/include/asm/rpn.hpp
@@ -22,15 +22,6 @@ struct Expression {
 	std::vector<uint8_t> rpn{}; // Bytes serializing the RPN expression
 	uint32_t rpnPatchSize = 0;  // Size the expression will take in the object file
 
-	Expression() = default;
-	Expression(Expression &&) = default;
-#ifdef _MSC_VER
-	// MSVC and WinFlexBison won't build without this...
-	Expression(Expression const &) = default;
-#endif
-
-	Expression &operator=(Expression &&) = default;
-
 	bool isKnown() const { return data.holds<int32_t>(); }
 	int32_t value() const { return data.get<int32_t>(); }
 
diff --git a/src/asm/parser.y b/src/asm/parser.y
index 3f7ca62f..4f45d87b 100644
--- a/src/asm/parser.y
+++ b/src/asm/parser.y
@@ -31,15 +31,6 @@
 	struct StrFmtArgList {
 		std::string format;
 		std::vector<Either<uint32_t, std::string>> args;
-
-		StrFmtArgList() = default;
-		StrFmtArgList(StrFmtArgList &&) = default;
-	#ifdef _MSC_VER
-		// MSVC and WinFlexBison won't build without this...
-		StrFmtArgList(StrFmtArgList const &) = default;
-	#endif
-
-		StrFmtArgList &operator=(StrFmtArgList &&) = default;
 	};
 }