diff --git a/src/devices/cpu/m68000/m68kfpu.hxx b/src/devices/cpu/m68000/m68kfpu.hxx
index 43471ea4801..866301acb9f 100644
--- a/src/devices/cpu/m68000/m68kfpu.hxx
+++ b/src/devices/cpu/m68000/m68kfpu.hxx
@@ -1480,6 +1480,16 @@ void fpgen_rm_reg(u16 w2)
 			m_icount -= 43;
 			break;
 		}
+		case 0x21:      // FMOD
+		{
+			s8 const mode = float_rounding_mode;
+			float_rounding_mode = float_round_to_zero;
+			m_fpr[dst] = floatx80_rem(m_fpr[dst], source);
+			SET_CONDITION_CODES(m_fpr[dst]);
+			float_rounding_mode = mode;
+			m_icount -= 43;   // guess
+			break;
+		}
 		case 0x22:      // FADD
 		{
 			m_fpr[dst] = floatx80_add(m_fpr[dst], source);