diff --git a/src/isa-thumb.c b/src/isa-thumb.c
index e5092f552..917f7703e 100644
--- a/src/isa-thumb.c
+++ b/src/isa-thumb.c
@@ -358,7 +358,11 @@ DEFINE_LOAD_STORE_MULTIPLE_EX_THUMB(PUSHR, \
 
 DEFINE_INSTRUCTION_THUMB(ILL, ARM_STUB)
 DEFINE_INSTRUCTION_THUMB(BKPT, ARM_STUB)
-DEFINE_INSTRUCTION_THUMB(B, ARM_STUB)
+DEFINE_INSTRUCTION_THUMB(B, \
+	int16_t immediate = (opcode & 0x07FF) << 5; \
+	cpu->gprs[ARM_PC] += (((int32_t) immediate) >> 4); \
+	THUMB_WRITE_PC;)
+
 DEFINE_INSTRUCTION_THUMB(BL1, \
 	int16_t immediate = (opcode & 0x07FF) << 5; \
 	cpu->gprs[ARM_LR] = cpu->gprs[ARM_PC] + (((int32_t) immediate) << 7);)