diff --git a/libunwind/src/Unwind-EHABI.cpp b/libunwind/src/Unwind-EHABI.cpp
--- a/libunwind/src/Unwind-EHABI.cpp
+++ b/libunwind/src/Unwind-EHABI.cpp
@@ -258,7 +258,7 @@
       uint32_t sp;
       _Unwind_VRS_Get(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp);
       if (byte & 0x40)
-        sp -= (((uint32_t)byte & 0x3f) << 2) + 4;
+        sp -= (((uint32_t)byte & 0x3f) << 2) - 4;
       else
         sp += ((uint32_t)byte << 2) + 4;
       _Unwind_VRS_Set(context, _UVRSC_CORE, UNW_ARM_SP, _UVRSD_UINT32, &sp);