diff --git a/py/nlraarch64.c b/py/nlraarch64.c
index fcc318f2dc..d6d87ebc50 100644
--- a/py/nlraarch64.c
+++ b/py/nlraarch64.c
@@ -75,7 +75,7 @@ NORETURN void nlr_jump(void *val) {
         "ret                     \n"
         :
         : "r" (top)
-        :
+        : "memory"
         );
 
     MP_UNREACHABLE
diff --git a/py/nlrmips.c b/py/nlrmips.c
index bd5d73b6f7..cba52b16a2 100644
--- a/py/nlrmips.c
+++ b/py/nlrmips.c
@@ -78,7 +78,7 @@ NORETURN void nlr_jump(void *val) {
         "nop            \n"
         :
         : "r" (top)
-        :
+        : "memory"
         );
     MP_UNREACHABLE
 }
diff --git a/py/nlrpowerpc.c b/py/nlrpowerpc.c
index 448459216b..8a69fe1eec 100644
--- a/py/nlrpowerpc.c
+++ b/py/nlrpowerpc.c
@@ -114,7 +114,7 @@ NORETURN void nlr_jump(void *val) {
         "blr ;"
         :
         : "r" (&top->regs)
-        :
+        : "memory"
         );
 
     MP_UNREACHABLE;
@@ -203,7 +203,7 @@ NORETURN void nlr_jump(void *val) {
         "blr ;"
         :
         : "r" (&top->regs)
-        :
+        : "memory"
         );
 
     MP_UNREACHABLE;
diff --git a/py/nlrthumb.c b/py/nlrthumb.c
index a8ffecc470..a22c5df5b9 100644
--- a/py/nlrthumb.c
+++ b/py/nlrthumb.c
@@ -132,7 +132,7 @@ NORETURN void nlr_jump(void *val) {
         "bx     lr                  \n" // return
         :                           // output operands
         : "r" (top)                 // input operands
-        :                           // clobbered registers
+        : "memory"                  // clobbered registers
         );
 
     MP_UNREACHABLE
diff --git a/py/nlrx64.c b/py/nlrx64.c
index 6b7d0262f5..d1ad91ff7d 100644
--- a/py/nlrx64.c
+++ b/py/nlrx64.c
@@ -123,7 +123,7 @@ NORETURN void nlr_jump(void *val) {
         "ret                        \n" // return
         :                           // output operands
         : "r" (top)                 // input operands
-        :                           // clobbered registers
+        : "memory"                  // clobbered registers
         );
 
     MP_UNREACHABLE
diff --git a/py/nlrx86.c b/py/nlrx86.c
index f658d41910..085e30d203 100644
--- a/py/nlrx86.c
+++ b/py/nlrx86.c
@@ -95,7 +95,7 @@ NORETURN void nlr_jump(void *val) {
         "ret                        \n" // return
         :                           // output operands
         : "r" (top)                 // input operands
-        :                           // clobbered registers
+        : "memory"                  // clobbered registers
         );
 
     MP_UNREACHABLE
diff --git a/py/nlrxtensa.c b/py/nlrxtensa.c
index abe9042af9..ff7af6edee 100644
--- a/py/nlrxtensa.c
+++ b/py/nlrxtensa.c
@@ -74,7 +74,7 @@ NORETURN void nlr_jump(void *val) {
         "ret.n                      \n" // return
         :                           // output operands
         : "r" (top)                 // input operands
-        :                           // clobbered registers
+        : "memory"                  // clobbered registers
         );
 
     MP_UNREACHABLE