diff --git a/src/isa-thumb.c b/src/isa-thumb.c
index da28f27af..a880efb62 100644
--- a/src/isa-thumb.c
+++ b/src/isa-thumb.c
@@ -228,7 +228,7 @@ DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(CMN, ARM_STUB)
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(ORR, cpu->gprs[rd] = cpu->gprs[rd] | cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MUL, ARM_STUB)
 DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(BIC, ARM_STUB)
-DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MVN, ARM_STUB)
+DEFINE_DATA_FORM_5_INSTRUCTION_THUMB(MVN, cpu->gprs[rd] = ~cpu->gprs[rn]; THUMB_NEUTRAL_S( , , cpu->gprs[rd]))
 
 #define DEFINE_INSTRUCTION_WITH_HIGH_EX_THUMB(NAME, H1, H2, BODY) \
 	DEFINE_INSTRUCTION_THUMB(NAME, \