diff --git a/include/asm/charmap.hpp b/include/asm/charmap.hpp
index 18d851a3..6bedaeeb 100644
--- a/include/asm/charmap.hpp
+++ b/include/asm/charmap.hpp
@@ -10,8 +10,7 @@
 #include <string_view>
 #include <vector>
 
-#define DEFAULT_CHARMAP_NAME "main"
-
+void charmap_Init();
 bool charmap_ForEach(
     void (*mapFunc)(std::string const &),
     void (*charFunc)(std::string const &, std::vector<int32_t>)
diff --git a/src/asm/charmap.cpp b/src/asm/charmap.cpp
index 0154e132..ab8ae611 100644
--- a/src/asm/charmap.cpp
+++ b/src/asm/charmap.cpp
@@ -23,6 +23,8 @@
 
 #include "asm/warning.hpp"
 
+#define DEFAULT_CHARMAP_NAME "main"
+
 static bool compareNode(std::pair<char, size_t> edge, char c) {
 	return edge.first < c;
 }
@@ -91,6 +93,10 @@ static InsertionOrderedMap<Charmap> charmaps;
 static Charmap *currentCharmap;
 static std::stack<Charmap *> charmapStack;
 
+void charmap_Init() {
+	charmap_New(DEFAULT_CHARMAP_NAME, nullptr);
+}
+
 bool charmap_ForEach(
     void (*mapFunc)(std::string const &),
     void (*charFunc)(std::string const &, std::vector<int32_t>)
diff --git a/src/asm/main.cpp b/src/asm/main.cpp
index afd5d9f7..38979f33 100644
--- a/src/asm/main.cpp
+++ b/src/asm/main.cpp
@@ -558,7 +558,7 @@ int main(int argc, char *argv[]) {
 
 	options.printDep(*localOptions.inputFileName);
 
-	charmap_New(DEFAULT_CHARMAP_NAME, nullptr);
+	charmap_Init();
 
 	// Init lexer and file stack, and parse (`yy::parser` is auto-generated from `parser.y`)
 	if (yy::parser parser; fstk_Init(*localOptions.inputFileName) && parser.parse() != 0) {