diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 6801e23665bf915932ea9c4b02df54150202129d..97a0c6912b181e317c17da6139c7d36ea09ea2eb 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -688,7 +688,7 @@ pub const StackIterator = struct {
             }
 
             return true;
-        } else if (@hasDecl(os.system, "msync") and native_os != .wasi) {
+        } else if (@hasDecl(os.system, "msync") and native_os != .wasi and native_os != .emscripten) {
             os.msync(aligned_memory, os.MSF.ASYNC) catch |err| {
                 switch (err) {
                     os.MSyncError.UnmappedMemory => {