diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md
index e120ed8f025f..ce78615e15f8 100644
--- a/gcc/config/m68k/m68k.md
+++ b/gcc/config/m68k/m68k.md
@@ -6371,7 +6371,7 @@
      (set (match_dup 0)
 	  (plus:HI (match_dup 0)
 		   (const_int -1)))])]
-  "DATA_REG_P (operands[0])"
+  "DATA_REG_P (operands[0]) && ! flags_in_68881 ()"
   "*
 {
   CC_STATUS_INIT;
@@ -6395,7 +6395,7 @@
      (set (match_dup 0)
 	  (plus:SI (match_dup 0)
 		   (const_int -1)))])]
-  "DATA_REG_P (operands[0])"
+  "DATA_REG_P (operands[0]) && ! flags_in_68881 ()"
   "*
 {
   CC_STATUS_INIT;