diff --git a/include/asm/mylink.h b/include/asm/mylink.h
index 14f548c6..b72e2ead 100644
--- a/include/asm/mylink.h
+++ b/include/asm/mylink.h
@@ -86,7 +86,10 @@ enum {
 
 	RPN_HRAM,
 
-	RPN_PCEZP,
+	/* TODO: This hasn't been removed in order not to break compatibility
+	 * with the existing object files, but it will be removed in a future
+	 * version. */
+	RPN_unused,
 
 	RPN_RANGECHECK,
 
diff --git a/include/link/mylink.h b/include/link/mylink.h
index 22793d29..6343defb 100644
--- a/include/link/mylink.h
+++ b/include/link/mylink.h
@@ -44,7 +44,10 @@ enum eRpnData {
 
 	RPN_HRAM,
 
-	RPN_PCEZP,
+	/* TODO: This hasn't been removed in order not to break compatibility
+	 * with the existing object files, but it will be removed in a future
+	 * version. */
+	RPN_unused,
 
 	RPN_RANGECHECK,
 
diff --git a/src/link/patch.c b/src/link/patch.c
index edb227bb..afdcead7 100644
--- a/src/link/patch.c
+++ b/src/link/patch.c
@@ -175,15 +175,6 @@ calcrpn(struct sPatch * pPatch)
 				    pPatch->pzFilename, pPatch->nLineNo);
 			}
 			break;
-		case RPN_PCEZP:
-			t = rpnpop();
-			rpnpush(t & 0xFF);
-			if (t < 0x2000 || t > 0x20FF) {
-				errx(1,
-				    "%s(%ld) : Value must be in the ZP area",
-				    pPatch->pzFilename, pPatch->nLineNo);
-			}
-			break;
 		case RPN_CONST:
 			/* constant */
 			t = (*rpn++);