diff --git a/src/linker/lnk_symbol_table.c b/src/linker/lnk_symbol_table.c
index e27d4bf3..7d04d353 100644
--- a/src/linker/lnk_symbol_table.c
+++ b/src/linker/lnk_symbol_table.c
@@ -145,9 +145,30 @@ lnk_can_replace_symbol(LNK_SymbolScope scope, LNK_Symbol *dst, LNK_Symbol *src)
     if (dst_interp == COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Regular) {
       can_replace = 1;
     }
-    // undefined vs weak
-    else if (dst_interp == COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Weak) {
-      can_replace = 1;
+    // (weak vs undefined) or (undefined vs weak)
+    else if ((dst_interp == COFF_SymbolValueInterp_Weak && src_interp == COFF_SymbolValueInterp_Undefined) || (dst_interp == COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Weak)) {
+      LNK_Symbol *weak, *undef;
+      COFF_ParsedSymbol weak_parsed;
+      if (dst_interp == COFF_SymbolValueInterp_Weak) {
+        weak        = dst;
+        undef       = src;
+        weak_parsed = dst_parsed;
+      } else {
+        weak        = src;
+        undef       = dst;
+        weak_parsed = src_parsed;
+      }
+
+      COFF_SymbolWeakExt *weak_ext = coff_parse_weak_tag(weak_parsed, weak->u.defined.obj->header.is_big_obj);
+      if (weak_ext->characteristics == COFF_WeakExt_SearchLibrary) {
+        can_replace = lnk_symbol_defined_is_before(weak, undef);
+      } else if (weak_ext->characteristics == COFF_WeakExt_NoLibrary) {
+        can_replace = dst_interp == COFF_SymbolValueInterp_Weak;
+      } else if (weak_ext->characteristics == COFF_WeakExt_SearchAlias) {
+        can_replace = dst_interp == COFF_SymbolValueInterp_Undefined;
+      } else {
+        can_replace = lnk_symbol_defined_is_before(src, dst);
+      }
     }
     // undefined vs undefined
     else if (dst_interp == COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Undefined) {
@@ -165,7 +186,7 @@ lnk_can_replace_symbol(LNK_SymbolScope scope, LNK_Symbol *dst, LNK_Symbol *src)
     else if (dst_interp == COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Debug) {
       can_replace = 1;
     }
-    // regular/weak/common/abs/debug vs undefined
+    // regular/common/abs/debug vs undefined
     else if (dst_interp != COFF_SymbolValueInterp_Undefined && src_interp == COFF_SymbolValueInterp_Undefined) {
       can_replace = 0;
     }
@@ -197,7 +218,25 @@ lnk_can_replace_symbol(LNK_SymbolScope scope, LNK_Symbol *dst, LNK_Symbol *src)
     }
     // weak vs weak
     else if (dst_interp == COFF_SymbolValueInterp_Weak && src_interp == COFF_SymbolValueInterp_Weak) {
-      can_replace = lnk_symbol_defined_is_before(src, dst);
+      COFF_ParsedSymbol dst_parsed = lnk_parsed_symbol_from_defined(dst);
+      COFF_ParsedSymbol src_parsed = lnk_parsed_symbol_from_defined(src);
+      COFF_SymbolWeakExt *dst_ext = coff_parse_weak_tag(dst_parsed, dst->u.defined.obj->header.is_big_obj);
+      COFF_SymbolWeakExt *src_ext = coff_parse_weak_tag(src_parsed, src->u.defined.obj->header.is_big_obj);
+      if (dst_ext->characteristics == COFF_WeakExt_SearchAlias && src_ext->characteristics == COFF_WeakExt_SearchAlias) {
+        // TODO: test
+        lnk_error_multiply_defined_symbol(dst, src);
+      } else if (dst_ext->characteristics == COFF_WeakExt_SearchAlias && src_ext->characteristics != COFF_WeakExt_SearchAlias) {
+        // TODO: test
+        can_replace = 0;
+      } else if (dst_ext->characteristics != COFF_WeakExt_SearchAlias && src_ext->characteristics == COFF_WeakExt_SearchAlias) {
+        // TODO: test
+        can_replace = 1;
+      } else if (dst_ext->characteristics == COFF_WeakExt_NoLibrary && src_ext->characteristics == COFF_WeakExt_AntiDependency) {
+        can_replace = 1;
+        can_replace = lnk_symbol_defined_is_before(src, dst);
+      } else {
+        can_replace = lnk_symbol_defined_is_before(src, dst);
+      }
     }
     // weak vs regular/abs/common
     else if (dst_interp == COFF_SymbolValueInterp_Weak && (src_interp == COFF_SymbolValueInterp_Regular || src_interp == COFF_SymbolValueInterp_Abs || src_interp == COFF_SymbolValueInterp_Common)) {