diff --git a/include/asm/lexer.hpp b/include/asm/lexer.hpp
index 940595d3..d6c16b1b 100644
--- a/include/asm/lexer.hpp
+++ b/include/asm/lexer.hpp
@@ -31,7 +31,7 @@ struct Expansion {
 	std::optional<std::string> name;
 	union {
 		char const *unowned;
-		char *owned; // Non-`const` only so it can be `free()`d
+		char *owned; // Non-`const` only so it can be `delete []`d
 	} contents;
 	size_t size; // Length of the contents
 	size_t offset; // Cursor into the contents
diff --git a/src/asm/lexer.cpp b/src/asm/lexer.cpp
index 5780d506..94862a25 100644
--- a/src/asm/lexer.cpp
+++ b/src/asm/lexer.cpp
@@ -517,7 +517,7 @@ void lexer_CheckRecursionDepth()
 static void freeExpansion(Expansion &expansion)
 {
 	if (expansion.owned)
-		free(expansion.contents.owned);
+		delete [] expansion.contents.owned;
 }
 
 static bool isMacroChar(char c)
diff --git a/src/asm/macro.cpp b/src/asm/macro.cpp
index 19be7182..9bb4862d 100644
--- a/src/asm/macro.cpp
+++ b/src/asm/macro.cpp
@@ -63,7 +63,7 @@ char const *macro_GetAllArgs()
 	for (uint32_t i = macroArgs->shift; i < nbArgs; i++)
 		len += macroArgs->args[i].length() + 1; // 1 for comma
 
-	char *str = (char *)malloc(len + 1); // 1 for '\0'
+	char *str = new char[len + 1]; // 1 for '\0'
 	char *ptr = str;
 
 	if (!str)