1 files changed, 17 insertions, 16 deletions
diff --git a/lib/system/jssys.nim b/lib/system/jssys.nim
index 27dd9b020..077c81d59 100644
--- a/lib/system/jssys.nim
+++ b/lib/system/jssys.nim
@@ -475,26 +475,27 @@ proc absInt(a: int): int {.compilerproc.} =
 proc absInt64(a: int64): int64 {.compilerproc.} =
   result = if a < 0: a*(-1) else: a
 
-proc ze*(a: int): int {.compilerproc.} =
-  result = a
+when not defined(nimNoZeroExtendMagic):
+  proc ze*(a: int): int {.compilerproc.} =
+    result = a
 
-proc ze64*(a: int64): int64 {.compilerproc.} =
-  result = a
+  proc ze64*(a: int64): int64 {.compilerproc.} =
+    result = a
 
-proc toU8*(a: int): int8 {.asmNoStackFrame, compilerproc.} =
-  asm """
-    return `a`;
-  """
+  proc toU8*(a: int): int8 {.asmNoStackFrame, compilerproc.} =
+    asm """
+      return `a`;
+    """
 
-proc toU16*(a: int): int16 {.asmNoStackFrame, compilerproc.} =
-  asm """
-    return `a`;
-  """
+  proc toU16*(a: int): int16 {.asmNoStackFrame, compilerproc.} =
+    asm """
+      return `a`;
+    """
 
-proc toU32*(a: int64): int32 {.asmNoStackFrame, compilerproc.} =
-  asm """
-    return `a`;
-  """
+  proc toU32*(a: int64): int32 {.asmNoStackFrame, compilerproc.} =
+    asm """
+      return `a`;
+    """
 
 proc nimMin(a, b: int): int {.compilerproc.} = return if a <= b: a else: b
 proc nimMax(a, b: int): int {.compilerproc.} = return if a >= b: a else: b