diff --git a/src/isa-thumb.c b/src/isa-thumb.c
index 52262972c..c13c92a97 100644
--- a/src/isa-thumb.c
+++ b/src/isa-thumb.c
@@ -344,8 +344,8 @@ DEFINE_INSTRUCTION_THUMB(ILL, ARM_STUB)
 DEFINE_INSTRUCTION_THUMB(BKPT, ARM_STUB)
 DEFINE_INSTRUCTION_THUMB(B, ARM_STUB)
 DEFINE_INSTRUCTION_THUMB(BL1, \
-	int16_t immediate = (opcode & 0x07FF) << 7; \
-	cpu->gprs[ARM_LR] = cpu->gprs[ARM_PC] + (((int32_t) immediate) << 5);)
+	int16_t immediate = (opcode & 0x07FF) << 5; \
+	cpu->gprs[ARM_LR] = cpu->gprs[ARM_PC] + (((int32_t) immediate) << 7);)
 
 DEFINE_INSTRUCTION_THUMB(BL2, \
 	uint16_t immediate = (opcode & 0x07FF) << 1; \