diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index 2d3b089..8f38bfd6 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -87,7 +87,7 @@
 	ic	%r3,.Lscpa1-PARMAREA(%r4)
 	chi	%r3,0x00
 	jne	.Lcompmem
-	l	%r3,.Lscpa2-PARMAREA(%r13)
+	l	%r3,.Lscpa2-PARMAREA(%r4)
 .Lcompmem:
 	mr	%r2,%r1			# mem in MB on 128-bit
 	l	%r1,.Lonemb-.LPG1(%r13)
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index f08c06f..ad5d87f 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -86,7 +86,7 @@
 	ic    %r3,.Lscpa1-PARMAREA(%r4)
 	chi   %r3,0x00
 	jne   .Lcompmem
-	l     %r3,.Lscpa2-PARMAREA(%r13)
+	l     %r3,.Lscpa2-PARMAREA(%r4)
 .Lcompmem:
 	mlgr  %r2,%r1			# mem in MB on 128-bit
 	l     %r1,.Lonemb-.LPG1(%r13)