diff --git a/tcl/board/lemaker_hikey.cfg b/tcl/board/lemaker_hikey.cfg
index ee677c34b..325b6fdda 100644
--- a/tcl/board/lemaker_hikey.cfg
+++ b/tcl/board/lemaker_hikey.cfg
@@ -17,7 +17,7 @@ proc core_up { args } {
 	global _TARGETNAME
 
 	# examine remaining cores
-	foreach _core [set args] {
+	foreach _core $args {
 		${_TARGETNAME}$_core arp_examine
 	}
 }
diff --git a/tcl/board/tocoding_poplar.cfg b/tcl/board/tocoding_poplar.cfg
index 6d2e6354e..36d5aec47 100644
--- a/tcl/board/tocoding_poplar.cfg
+++ b/tcl/board/tocoding_poplar.cfg
@@ -19,7 +19,7 @@ proc core_up { args } {
 	global _TARGETNAME
 
 	# examine remaining cores
-	foreach _core [set args] {
+	foreach _core $args {
 		${_TARGETNAME}$_core arp_examine
 	}
 }
diff --git a/tcl/target/bluefield.cfg b/tcl/target/bluefield.cfg
index 62b1e3165..dcebb2fb1 100644
--- a/tcl/target/bluefield.cfg
+++ b/tcl/target/bluefield.cfg
@@ -72,7 +72,7 @@ proc core_up { args } {
 	global _TARGETNAME
 
 	# Examine remaining cores
-	foreach _core [set args] {
+	foreach _core $args {
 		${_TARGETNAME}$_core arp_examine
 	}
 }
diff --git a/tcl/target/xilinx_zynqmp.cfg b/tcl/target/xilinx_zynqmp.cfg
index e66289a70..2df7a4ff9 100644
--- a/tcl/target/xilinx_zynqmp.cfg
+++ b/tcl/target/xilinx_zynqmp.cfg
@@ -99,7 +99,7 @@ targets $_TARGETNAME.0
 
 proc core_up { args } {
     global _TARGETNAME
-    foreach { core } [set args] {
+    foreach core $args {
         $_TARGETNAME.$core arp_examine
     }
 }