diff --git a/sys/powerpc/powerpc/swtch32.S b/sys/powerpc/powerpc/swtch32.S
--- a/sys/powerpc/powerpc/swtch32.S
+++ b/sys/powerpc/powerpc/swtch32.S
@@ -141,8 +141,8 @@
 blocked_loop:
 	lwz	%r7,TD_LOCK(%r2)
 	cmpw	%r6,%r7 
-	beq-	blocked_loop
 	isync
+	beq-	blocked_loop
 #endif
 
 	lwz	%r17,TD_PCB(%r2)	/* Get new current PCB */
diff --git a/sys/powerpc/powerpc/swtch64.S b/sys/powerpc/powerpc/swtch64.S
--- a/sys/powerpc/powerpc/swtch64.S
+++ b/sys/powerpc/powerpc/swtch64.S
@@ -194,8 +194,8 @@
 blocked_loop:
 	ld	%r7,TD_LOCK(%r13)
 	cmpd	%r6,%r7 
-	beq-	blocked_loop
 	isync
+	beq-	blocked_loop
 #endif
 	
 	ld	%r17,TD_PCB(%r13)	/* Get new PCB */