diff --git a/include/asm/fstack.hpp b/include/asm/fstack.hpp
index 81aea529..f6613e25 100644
--- a/include/asm/fstack.hpp
+++ b/include/asm/fstack.hpp
@@ -58,6 +58,7 @@ void fstk_AddIncludePath(std::string const &path);
 void fstk_AddPreIncludeFile(std::string const &path);
 std::optional<std::string> fstk_FindFile(std::string const &path);
 bool fstk_FileError(std::string const &path, char const *functionName);
+bool fstk_FailedOnMissingInclude();
 
 bool yywrap();
 bool fstk_RunInclude(std::string const &path);
diff --git a/include/asm/main.hpp b/include/asm/main.hpp
index a2e2e089..8efb1892 100644
--- a/include/asm/main.hpp
+++ b/include/asm/main.hpp
@@ -41,7 +41,6 @@ struct Options {
 };
 
 extern Options options;
-extern bool failedOnMissingInclude;
 
 #define verbosePrint(...) \
 	do { \
diff --git a/src/asm/fstack.cpp b/src/asm/fstack.cpp
index 3dc371de..60997bc0 100644
--- a/src/asm/fstack.cpp
+++ b/src/asm/fstack.cpp
@@ -46,6 +46,7 @@ static std::stack<Context> contextStack;
 // The first include path for `fstk_FindFile` to try is none at all
 static std::vector<std::string> includePaths = {""}; // -I
 static std::deque<std::string> preIncludeNames;      // -P
+static bool failedOnMissingInclude = false;
 
 std::string FileStackNode::reptChain() const {
 	std::string chain;
@@ -317,6 +318,10 @@ bool fstk_FileError(std::string const &path, char const *functionName) {
 	return false;
 }
 
+bool fstk_FailedOnMissingInclude() {
+	return failedOnMissingInclude;
+}
+
 bool fstk_RunInclude(std::string const &path) {
 	if (std::optional<std::string> fullPath = fstk_FindFile(path); fullPath) {
 		newFileContext(*fullPath, false);
diff --git a/src/asm/main.cpp b/src/asm/main.cpp
index 72ecd3e2..1ca9ce96 100644
--- a/src/asm/main.cpp
+++ b/src/asm/main.cpp
@@ -26,8 +26,6 @@
 
 Options options;
 
-bool failedOnMissingInclude = false;
-
 // Escapes Make-special chars from a string
 static std::string make_escape(std::string &str) {
 	std::string escaped;
@@ -424,7 +422,7 @@ int main(int argc, char *argv[]) {
 		nbErrors = 1;
 	}
 
-	if (!failedOnMissingInclude) {
+	if (!fstk_FailedOnMissingInclude()) {
 		sect_CheckUnionClosed();
 		sect_CheckLoadClosed();
 		sect_CheckSizes();
@@ -440,7 +438,7 @@ int main(int argc, char *argv[]) {
 	}
 
 	// If parse aborted due to missing an include, and `-MG` was given, exit normally
-	if (failedOnMissingInclude) {
+	if (fstk_FailedOnMissingInclude()) {
 		return 0;
 	}