diff --git a/src/isa-thumb.c b/src/isa-thumb.c
index 44fabe740..b766fbe17 100644
--- a/src/isa-thumb.c
+++ b/src/isa-thumb.c
@@ -97,13 +97,13 @@ DEFINE_DATA_FORM_1_INSTRUCTION_THUMB(SUB, )
 DEFINE_DATA_FORM_2_INSTRUCTION_THUMB(ADD, )
 DEFINE_DATA_FORM_2_INSTRUCTION_THUMB(SUB, )
 
-#define DEFINE_DATA_FORM_3_INSTRUCTION_EX_THUMB(NAME, RM, BODY) \
+#define DEFINE_DATA_FORM_3_INSTRUCTION_EX_THUMB(NAME, RD, BODY) \
 	DEFINE_INSTRUCTION_THUMB(NAME, \
 		int rd = RD; \
 		BODY;)
 
 #define DEFINE_DATA_FORM_3_INSTRUCTION_THUMB(NAME, BODY) \
-	COUNT_3(DEFINE_DATA_FORM_2_INSTRUCTION_EX_THUMB, NAME ## _R, BODY)
+	COUNT_3(DEFINE_DATA_FORM_3_INSTRUCTION_EX_THUMB, NAME ## _R, BODY)
 
 DEFINE_DATA_FORM_3_INSTRUCTION_THUMB(ADD2, )
 DEFINE_DATA_FORM_3_INSTRUCTION_THUMB(CMP1, )