diff --git a/src/rt/arch/i386/morestack.S b/src/rt/arch/i386/morestack.S
index c4090df109d8e2920da376304e4d6ac20ae5c633..7a4c56aeb0b28ada2be711f7c7ad2beb86b3f56d 100644
--- a/src/rt/arch/i386/morestack.S
+++ b/src/rt/arch/i386/morestack.S
@@ -201,9 +201,6 @@ MORESTACK:
 	// Save the return value of the function we allocated space for
 	movl %eax, (%esp)
 
-	// Now that we're on the return path we want to avoid
-	// stomping on %eax. FIXME: Need to save and restore %eax to
-	// actually preserve it across the call to delete the stack
 	call UPCALL_DEL_STACK
 
 	// And restore it
diff --git a/src/rt/arch/x86_64/morestack.S b/src/rt/arch/x86_64/morestack.S
index f4d897f1cf4a8c13e931f9bfe19d05dc606b961b..2b118e4a0594735d968afe152163b3bf27445e57 100644
--- a/src/rt/arch/x86_64/morestack.S
+++ b/src/rt/arch/x86_64/morestack.S
@@ -103,7 +103,6 @@ MORESTACK:
 	// Save the return value
 	pushq %rax
 
-	// FIXME: Should preserve %rax here
 #ifdef __APPLE__
 	call UPCALL_DEL_STACK
 #endif