diff --git a/src/cmdd.c b/src/cmdd.c
index a0e260c..ed2b883 100644
--- a/src/cmdd.c
+++ b/src/cmdd.c
@@ -77,15 +77,15 @@ void commandDR() {
 
 void commandDF() {
 	int *data_var = getCaliVariable();
-	int varno     = preVarNo;
+	int page      = preVarPage;
+	int offset    = preVarIndex;
 	int cnt       = getCaliValue();
 	int data      = getCaliValue();
 	
 	DEBUG_COMMAND("DF %p,%d,%d:\n", data_var, cnt, data);
 
-	const arrayVarStruct* array = &sysVarAttribute[varno];
-	if (array->page) {
-		int maxlen = arrayVarBuffer[array->page - 1].size - array->offset - *array->pointvar;
+	if (page) {
+		int maxlen = arrayVarBuffer[page - 1].size - offset;
 		if (cnt > maxlen) {
 			WARNING("%03d:%05x: count exceeds array boundary (%d > %d)\n", sl_getPage(), sl_getIndex(), cnt, maxlen);
 			cnt = maxlen;
diff --git a/src/variable.c b/src/variable.c
index 1de3f96..04d0265 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -30,10 +30,16 @@
 #include "xsystem35.h"
 #include "scenario.h"
 
+typedef struct {
+	int *pointvar;
+	int page;
+	int offset;
+} VariableAttributes;
+
 /* システム変数 */
 int sysVar[SYSVAR_MAX];
 /* 配列変数の情報 */
-arrayVarStruct sysVarAttribute[SYSVAR_MAX];
+static VariableAttributes attributes[SYSVAR_MAX];
 /* 配列本体 */
 arrayVarBufferStruct arrayVarBuffer[ARRAYVAR_PAGEMAX];
 /* 64bit変数 */
@@ -57,7 +63,7 @@ static char *advance(const char *s, int n) {
 }
 
 int *v_ref(int var) {
-	arrayVarStruct *attr = &sysVarAttribute[var];
+	VariableAttributes *attr = &attributes[var];
 	preVarPage = attr->page;
 	preVarNo   = var;
 
@@ -80,7 +86,7 @@ int *v_ref(int var) {
 }
 
 int *v_ref_indexed(int var, int index) {
-	arrayVarStruct *attr = &sysVarAttribute[var];
+	VariableAttributes *attr = &attributes[var];
 	preVarPage = attr->page;
 	preVarNo   = var;
 
@@ -131,15 +137,15 @@ extern boolean v_defineArrayVar(int datavar, int *pointvar, int offset, int page
 	if (page    < 0 || page    >  ARRAYVAR_PAGEMAX - 1)          { return false; }
 	if (offset  < 0 || offset  >= arrayVarBuffer[page - 1].size) { return false; }
 	
-	sysVarAttribute[datavar].pointvar = pointvar;
-	sysVarAttribute[datavar].page     = page;
-	sysVarAttribute[datavar].offset   = offset;
+	attributes[datavar].pointvar = pointvar;
+	attributes[datavar].page     = page;
+	attributes[datavar].offset   = offset;
 	return true;
 }
 
 /* 配列変数の割り当て解除 DR */
 extern boolean v_releaseArrayVar(int datavar) {
-	sysVarAttribute[datavar].page = 0;
+	attributes[datavar].page = 0;
 	return true;
 }
 
diff --git a/src/variable.h b/src/variable.h
index 0de9232..b5edd49 100644
--- a/src/variable.h
+++ b/src/variable.h
@@ -39,14 +39,7 @@ typedef struct {
 	int *value;
 } arrayVarBufferStruct;
 
-typedef struct {
-	int *pointvar;
-	int page;
-	int offset;
-} arrayVarStruct;
-
 extern int sysVar[];
-extern arrayVarStruct sysVarAttribute[];
 extern arrayVarBufferStruct arrayVarBuffer[];
 extern double longVar[];