diff --git a/include/asm/lexer.hpp b/include/asm/lexer.hpp
index 1789b9b0..2b705450 100644
--- a/include/asm/lexer.hpp
+++ b/include/asm/lexer.hpp
@@ -88,11 +88,4 @@ struct AlignmentSpec {
 	uint16_t alignOfs;
 };
 
-#define INITIAL_DS_ARG_SIZE 2
-struct DsArgList {
-	size_t nbArgs;
-	size_t capacity;
-	struct Expression *args;
-};
-
 #endif // RGBDS_ASM_LEXER_H
diff --git a/include/asm/section.hpp b/include/asm/section.hpp
index 0cbf91c1..49f90d72 100644
--- a/include/asm/section.hpp
+++ b/include/asm/section.hpp
@@ -74,7 +74,7 @@ void sect_AbsWordGroup(uint8_t const *s, size_t length);
 void sect_AbsLongGroup(uint8_t const *s, size_t length);
 void sect_Skip(uint32_t skip, bool ds);
 void sect_RelByte(struct Expression *expr, uint32_t pcShift);
-void sect_RelBytes(uint32_t n, struct Expression *exprs, size_t size);
+void sect_RelBytes(uint32_t n, std::vector<struct Expression> &exprs);
 void sect_RelWord(struct Expression *expr, uint32_t pcShift);
 void sect_RelLong(struct Expression *expr, uint32_t pcShift);
 void sect_PCRelByte(struct Expression *expr, uint32_t pcShift);
diff --git a/src/asm/parser.y b/src/asm/parser.y
index 683ff3d4..ab549f4d 100644
--- a/src/asm/parser.y
+++ b/src/asm/parser.y
@@ -352,39 +352,18 @@ static void compoundAssignment(const char *symName, enum RPNCommand op, int32_t
 	sym_AddVar(symName, newValue);
 }
 
-static void initDsArgList(struct DsArgList *args)
+static void initDsArgList(std::vector<struct Expression> *&args)
 {
-	args->nbArgs = 0;
-	args->capacity = INITIAL_DS_ARG_SIZE;
-	args->args = (struct Expression *)malloc(args->capacity * sizeof(*args->args));
-	if (!args->args)
-		fatalerror("Failed to allocate memory for ds arg list: %s\n",
-			   strerror(errno));
-}
-
-static void appendDsArgList(struct DsArgList *args, const struct Expression *expr)
-{
-	if (args->nbArgs == args->capacity) {
-		args->capacity = (args->capacity + 1) * 2;
-		args->args = (struct Expression *)realloc(args->args, args->capacity * sizeof(*args->args));
-		if (!args->args)
-			fatalerror("realloc error while resizing ds arg list: %s\n",
-				   strerror(errno));
-	}
-	args->args[args->nbArgs++] = *expr;
-}
-
-static void freeDsArgList(struct DsArgList *args)
-{
-	free(args->args);
+	args = new(std::nothrow) std::vector<struct Expression>();
+	if (!args)
+		fatalerror("Failed to allocate memory for ds arg list: %s\n", strerror(errno));
 }
 
 static void initPurgeArgList(std::vector<char *> *&args)
 {
 	args = new(std::nothrow) std::vector<char *>();
 	if (!args)
-		fatalerror("Failed to allocate memory for purge arg list: %s\n",
-			   strerror(errno));
+		fatalerror("Failed to allocate memory for purge arg list: %s\n", strerror(errno));
 }
 
 static void freePurgeArgList(std::vector<char *> *&args)
@@ -486,7 +465,7 @@ enum {
 	struct MacroArgs *macroArg;
 	enum AssertionType assertType;
 	struct AlignmentSpec alignSpec;
-	struct DsArgList dsArgs;
+	std::vector<struct Expression> *dsArgs;
 	std::vector<char *> *purgeArgs;
 	struct ForArgs forArgs;
 	struct StrFmtArgList strfmtArgs;
@@ -1175,8 +1154,8 @@ endu		: T_POP_ENDU { sect_EndUnion(); }
 
 ds		: T_POP_DS uconst { sect_Skip($2, true); }
 		| T_POP_DS uconst T_COMMA ds_args trailing_comma {
-			sect_RelBytes($2, $4.args, $4.nbArgs);
-			freeDsArgList(&$4);
+			sect_RelBytes($2, *$4);
+			delete $4;
 		}
 		| T_POP_DS T_OP_ALIGN T_LBRACK align_spec T_RBRACK trailing_comma {
 			uint32_t n = sect_GetAlignBytes($4.alignment, $4.alignOfs);
@@ -1187,18 +1166,18 @@ ds		: T_POP_DS uconst { sect_Skip($2, true); }
 		| T_POP_DS T_OP_ALIGN T_LBRACK align_spec T_RBRACK T_COMMA ds_args trailing_comma {
 			uint32_t n = sect_GetAlignBytes($4.alignment, $4.alignOfs);
 
-			sect_RelBytes(n, $7.args, $7.nbArgs);
+			sect_RelBytes(n, *$7);
 			sect_AlignPC($4.alignment, $4.alignOfs);
-			freeDsArgList(&$7);
+			delete $7;
 		}
 ;
 
 ds_args		: reloc_8bit {
-			initDsArgList(&$$);
-			appendDsArgList(&$$, &$1);
+			initDsArgList($$);
+			$$->push_back($1);
 		}
 		| ds_args T_COMMA reloc_8bit {
-			appendDsArgList(&$1, &$3);
+			$1->push_back($3);
 			$$ = $1;
 		}
 ;
diff --git a/src/asm/section.cpp b/src/asm/section.cpp
index f60a6fdd..472d20d6 100644
--- a/src/asm/section.cpp
+++ b/src/asm/section.cpp
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <string>
 #include <string.h>
+#include <vector>
 
 #include "asm/fstack.hpp"
 #include "asm/main.hpp"
@@ -694,7 +695,7 @@ void sect_RelByte(struct Expression *expr, uint32_t pcShift)
 
 // Output several copies of a relocatable byte. Checking will be done to see if
 // it is an absolute value in disguise.
-void sect_RelBytes(uint32_t n, struct Expression *exprs, size_t size)
+void sect_RelBytes(uint32_t n, std::vector<struct Expression> &exprs)
 {
 	if (!checkcodesection())
 		return;
@@ -702,18 +703,18 @@ void sect_RelBytes(uint32_t n, struct Expression *exprs, size_t size)
 		return;
 
 	for (uint32_t i = 0; i < n; i++) {
-		struct Expression *expr = &exprs[i % size];
+		struct Expression &expr = exprs[i % exprs.size()];
 
-		if (!rpn_isKnown(expr)) {
-			createPatch(PATCHTYPE_BYTE, expr, i);
+		if (!rpn_isKnown(&expr)) {
+			createPatch(PATCHTYPE_BYTE, &expr, i);
 			writebyte(0);
 		} else {
-			writebyte(expr->val);
+			writebyte(expr.val);
 		}
 	}
 
-	for (size_t i = 0; i < size; i++)
-		rpn_Free(&exprs[i]);
+	for (struct Expression &expr : exprs)
+		rpn_Free(&expr);
 }
 
 // Output a relocatable word. Checking will be done to see if