diff --git a/include/asm/main.hpp b/include/asm/main.hpp
index 9e91b08a..2631e545 100644
--- a/include/asm/main.hpp
+++ b/include/asm/main.hpp
@@ -16,7 +16,7 @@ extern bool warnOnLdOpt;
 extern bool verbose;
 extern bool warnings; // True to enable warnings, false to disable them.
 
-extern FILE *dependfile;
+extern FILE *dependFile;
 extern std::string targetFileName;
 extern bool generatedMissingIncludes;
 extern bool failedOnMissingInclude;
diff --git a/src/asm/fstack.cpp b/src/asm/fstack.cpp
index a7e4c391..1a4c01d1 100644
--- a/src/asm/fstack.cpp
+++ b/src/asm/fstack.cpp
@@ -142,10 +142,10 @@ void fstk_SetPreIncludeFile(std::string const &path) {
 }
 
 static void printDep(std::string const &path) {
-	if (dependfile) {
-		fprintf(dependfile, "%s: %s\n", targetFileName.c_str(), path.c_str());
+	if (dependFile) {
+		fprintf(dependFile, "%s: %s\n", targetFileName.c_str(), path.c_str());
 		if (generatePhonyDeps)
-			fprintf(dependfile, "%s:\n", path.c_str());
+			fprintf(dependFile, "%s:\n", path.c_str());
 	}
 }
 
diff --git a/src/asm/main.cpp b/src/asm/main.cpp
index 8268493a..b8d988b3 100644
--- a/src/asm/main.cpp
+++ b/src/asm/main.cpp
@@ -10,6 +10,7 @@
 
 #include "error.hpp"
 #include "extern/getopt.hpp"
+#include "helpers.hpp" // Defer
 #include "parser.hpp"
 #include "version.hpp"
 
@@ -20,7 +21,7 @@
 #include "asm/symbol.hpp"
 #include "asm/warning.hpp"
 
-FILE *dependfile = nullptr;
+FILE *dependFile = nullptr;
 bool generatedMissingIncludes = false;
 bool failedOnMissingInclude = false;
 bool generatePhonyDeps = false;
@@ -37,7 +38,6 @@ bool warnings; // True to enable warnings, false to disable them.
 static std::string make_escape(std::string &str) {
 	std::string escaped;
 	size_t pos = 0;
-
 	for (;;) {
 		// All dollars needs to be doubled
 		size_t nextPos = str.find("$", pos);
@@ -114,18 +114,20 @@ static void printUsage() {
 
 int main(int argc, char *argv[]) {
 	time_t now = time(nullptr);
-	char const *sourceDateEpoch = getenv("SOURCE_DATE_EPOCH");
-
 	// Support SOURCE_DATE_EPOCH for reproducible builds
 	// https://reproducible-builds.org/docs/source-date-epoch/
-	if (sourceDateEpoch)
+	if (char const *sourceDateEpoch = getenv("SOURCE_DATE_EPOCH"); sourceDateEpoch)
 		now = (time_t)strtoul(sourceDateEpoch, nullptr, 0);
 
+	Defer closeDependFile{[&] {
+		if (dependFile)
+			fclose(dependFile);
+	}};
+
 	// Perform some init for below
 	sym_Init(now);
 
 	// Set defaults
-
 	opt_B("01");
 	opt_G("0123");
 	opt_P(0);
@@ -140,7 +142,6 @@ int main(int argc, char *argv[]) {
 	uint32_t maxDepth = DEFAULT_MAX_DEPTH;
 	char const *dependFileName = nullptr;
 	std::string newTarget;
-
 	// Maximum of 100 errors only applies if rgbasm is printing errors to a terminal.
 	if (isatty(STDERR_FILENO))
 		maxErrors = 100;
@@ -219,16 +220,16 @@ int main(int argc, char *argv[]) {
 			break;
 
 		case 'M':
-			if (dependfile)
+			if (dependFile)
 				warnx("Overriding dependfile %s", dependFileName);
 			if (!strcmp("-", musl_optarg)) {
-				dependfile = stdout;
+				dependFile = stdout;
 				dependFileName = "<stdout>";
 			} else {
-				dependfile = fopen(musl_optarg, "w");
+				dependFile = fopen(musl_optarg, "w");
 				dependFileName = musl_optarg;
 			}
-			if (dependfile == nullptr)
+			if (dependFile == nullptr)
 				err("Failed to open dependfile \"%s\"", dependFileName);
 			break;
 
@@ -357,12 +358,12 @@ int main(int argc, char *argv[]) {
 	if (verbose)
 		printf("Assembling %s\n", mainFileName.c_str());
 
-	if (dependfile) {
+	if (dependFile) {
 		if (targetFileName.empty())
 			errx("Dependency files can only be created if a target file is specified with either "
 			     "-o, -MQ or -MT");
 
-		fprintf(dependfile, "%s: %s\n", targetFileName.c_str(), mainFileName.c_str());
+		fprintf(dependFile, "%s: %s\n", targetFileName.c_str(), mainFileName.c_str());
 	}
 
 	charmap_New(DEFAULT_CHARMAP_NAME, nullptr);
@@ -375,9 +376,6 @@ int main(int argc, char *argv[]) {
 	if (parser.parse() != 0 && nbErrors == 0)
 		nbErrors = 1;
 
-	if (dependfile)
-		fclose(dependfile);
-
 	sect_CheckUnionClosed();
 
 	if (nbErrors != 0)
diff --git a/src/asm/output.cpp b/src/asm/output.cpp
index 8702c480..b7515904 100644
--- a/src/asm/output.cpp
+++ b/src/asm/output.cpp
@@ -302,7 +302,7 @@ static void writeFileStackNode(FileStackNode const &node, FILE *file) {
 	}
 }
 
-// Write an objectfile
+// Write an object file
 void out_WriteObject() {
 	FILE *file;
 	if (objectName != "-") {
@@ -352,7 +352,7 @@ void out_WriteObject() {
 		writeassert(assert, file);
 }
 
-// Set the objectfilename
+// Set the object filename
 void out_SetFileName(std::string const &name) {
 	if (!objectName.empty())
 		warnx("Overriding output filename %s", objectName.c_str());
diff --git a/src/asm/symbol.cpp b/src/asm/symbol.cpp
index d7325eba..85807a68 100644
--- a/src/asm/symbol.cpp
+++ b/src/asm/symbol.cpp
@@ -426,7 +426,7 @@ Symbol *sym_AddLabel(std::string const &symName) {
 	return sym;
 }
 
-static uint32_t anonLabelID;
+static uint32_t anonLabelID = 0;
 
 // Add an anonymous label
 Symbol *sym_AddAnonLabel() {
@@ -533,7 +533,7 @@ void sym_SetExportAll(bool set) {
 	exportAll = set;
 }
 
-// Initialize the symboltable
+// Define the built-in symbols
 void sym_Init(time_t now) {
 	PCSymbol = &createSymbol("@"s);
 	PCSymbol->type = SYM_LABEL;
@@ -598,7 +598,4 @@ void sym_Init(time_t now) {
 	sym_AddEqu("__UTC_HOUR__"s, time_utc->tm_hour)->isBuiltin = true;
 	sym_AddEqu("__UTC_MINUTE__"s, time_utc->tm_min)->isBuiltin = true;
 	sym_AddEqu("__UTC_SECOND__"s, time_utc->tm_sec)->isBuiltin = true;
-
-	labelScope = std::nullopt;
-	anonLabelID = 0;
 }