diff --git a/src/Zcu/PerThread.zig b/src/Zcu/PerThread.zig
index f0b1764f463dbe9d085e0fca931d20286e99255f..6635be1a1428d9971b6d23f8b0d61c2ec401681b 100644
--- a/src/Zcu/PerThread.zig
+++ b/src/Zcu/PerThread.zig
@@ -3655,6 +3655,10 @@ pub fn processExports(pt: Zcu.PerThread) (Allocator.Error || Io.Cancelable)!void
 
         for (alive_exports.items) |export_index| {
             const exp = export_index.ptr(zcu);
+            switch (exp.opts.linkage) {
+                .strong => {},
+                .weak, .internal, .link_once => continue,
+            }
             const gop = exports_by_name.getOrPutAssumeCapacity(exp.opts.name);
             if (gop.found_existing) {
                 const existing_exp = gop.value_ptr.*.ptr(zcu);
diff --git a/test/cases/export_override_libc.zig b/test/cases/export_override_libc.zig
new file mode 100644
index 0000000000000000000000000000000000000000..bc16cb8dd2cdfcb0f09da2da83715b2ec9715321
--- /dev/null
+++ b/test/cases/export_override_libc.zig
@@ -0,0 +1,16 @@
+/// This implementation is intentionally incorrect so we can check that it is
+/// called instead of the libc symbol.
+export fn isdigit(c: c_int) c_int {
+    return @intFromBool(c == '0');
+}
+
+pub fn main() void {
+    const static = struct {
+        extern fn isdigit(c_int) c_int;
+    };
+    if (static.isdigit('0') == 0) @panic("override failed: isdigit('0') == 0");
+    if (static.isdigit('1') != 0) @panic("override failed: isdigit('1') != 0");
+}
+
+// run
+// link_libc=true