diff --git a/main.c b/main.c
index bda82b0..fb4bf2e 100644
--- a/main.c
+++ b/main.c
@@ -2559,6 +2559,7 @@ int saveMaskedVolume_Text(char *path, char *maskpath){
     AnalyzeHeader	*mask_hdr;
     char			*mask_img;
     int				mask_dim[4];
+    int				i, j, k;
     
     loadVolume(maskpath,&mask_hdr,&mask_img);
     mask_dim[0]=mask_hdr->dim[1];
@@ -2571,9 +2572,9 @@ int saveMaskedVolume_Text(char *path, char *maskpath){
     
     printf("volume: min:%f max:%f \n",min(),max());
     
-    for(int i=0;i<dim[0];i++)
-		for(int j=0;j<dim[1];j++)
-			for(int k=0;k<dim[2];k++){
+    for(i=0;i<dim[0];i++)
+		for(j=0;j<dim[1];j++)
+			for(k=0;k<dim[2];k++){
                 int mask_i = k*mask_dim[1]*mask_dim[0]+j*mask_dim[0]+i;
                 if (getValue2(mask_i,mask_hdr, mask_img)!=0 ){               //masking
                     fprintf(f, "%f ",getValue(i, j, k));