diff --git a/arch/arm/src/armv6-m/up_svcall.c b/arch/arm/src/armv6-m/up_svcall.c
index ac5e89d7bb..1151c480e9 100644
--- a/arch/arm/src/armv6-m/up_svcall.c
+++ b/arch/arm/src/armv6-m/up_svcall.c
@@ -407,7 +407,7 @@ int up_svcall(int irq, FAR void *context)
            * parameter will reside at an offset of 4 from the stack pointer.
            */
 
-          regs[REG_R3]         = *(uint32_t*)(regs[REG_SP+4]);
+          regs[REG_R3]         = *(uint32_t*)(regs[REG_SP]+4);
         }
         break;
 #endif
diff --git a/arch/arm/src/armv7-a/arm_syscall.c b/arch/arm/src/armv7-a/arm_syscall.c
index 9fb46f3882..7be976ae07 100644
--- a/arch/arm/src/armv7-a/arm_syscall.c
+++ b/arch/arm/src/armv7-a/arm_syscall.c
@@ -378,7 +378,7 @@ uint32_t *arm_syscall(uint32_t *regs)
            * parameter will reside at an offset of 4 from the stack pointer.
            */
 
-          regs[REG_R3]   = *(uint32_t*)(regs[REG_SP+4]);
+          regs[REG_R3]   = *(uint32_t*)(regs[REG_SP]+4);
         }
         break;
 #endif
diff --git a/arch/arm/src/armv7-m/up_svcall.c b/arch/arm/src/armv7-m/up_svcall.c
index ada12e61a0..e0f0e3aeac 100644
--- a/arch/arm/src/armv7-m/up_svcall.c
+++ b/arch/arm/src/armv7-m/up_svcall.c
@@ -407,7 +407,7 @@ int up_svcall(int irq, FAR void *context)
            * parameter will reside at an offset of 4 from the stack pointer.
            */
 
-          regs[REG_R3]         = *(uint32_t*)(regs[REG_SP+4]);
+          regs[REG_R3]         = *(uint32_t*)(regs[REG_SP]+4);
         }
         break;
 #endif