diff --git a/passes.cc b/passes.cc
index 00b11e39..37db486b 100644
--- a/passes.cc
+++ b/passes.cc
@@ -303,8 +303,8 @@ void check_duplicate_symbols(Context<E> &ctx) {
       const ElfSym<E> &esym = file->elf_syms[i];
       Symbol<E> &sym = *file->symbols[i];
 
-      if (sym.file == file || esym.is_undef() || esym.is_common() ||
-          (esym.st_bind == STB_WEAK))
+      if (sym.file == file || sym.file == ctx.internal_obj ||
+          esym.is_undef() || esym.is_common() || (esym.st_bind == STB_WEAK))
         continue;
 
       if (!esym.is_abs() && !file->get_section(esym)->is_alive)
diff --git a/test/synthetic-symbols.sh b/test/synthetic-symbols.sh
new file mode 100755
index 00000000..dae10011
--- /dev/null
+++ b/test/synthetic-symbols.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+set -e
+cd $(dirname $0)
+echo -n "Testing $(basename -s .sh $0) ... "
+t=$(pwd)/tmp/$(basename -s .sh $0)
+mkdir -p $t
+
+cat <<EOF | clang -c -o $t/a.o -x assembler -
+.section foo,"a",@progbits
+.ascii "section foo"
+EOF
+
+# Test synthetic symbols
+
+cat <<EOF | clang -c -o $t/b.o -xc -
+#include <stdio.h>
+#include <string.h>
+
+extern char __ehdr_start[];
+extern char __executable_start[];
+extern char __start_foo[];
+extern char __stop_foo[];
+
+int main() {
+  printf("__ehdr_start=%p\n", &__ehdr_start);
+  printf("__executable_start=%p\n", &__executable_start);
+  printf("%.*s\n", (int)(__stop_foo - __start_foo), __start_foo);
+}
+EOF
+
+clang -fuse-ld=`pwd`/../mold -Wl,--image-base=0x40000 -o $t/exe $t/a.o $t/b.o
+$t/exe > $t/log
+
+grep -q '^__ehdr_start=0x40000$' $t/log
+grep -q '^__executable_start=0x40000$' $t/log
+grep -q '^section foo$' $t/log
+
+# Make sure that synthetic symbols overwrite existing ones
+
+cat <<EOF | clang -c -o $t/c.o -xc -
+#include <stdio.h>
+#include <string.h>
+
+char __ehdr_start[] = "foo";
+char __executable_start[] = "foo";
+char __start_foo[] = "foo";
+char __stop_foo[] = "foo";
+
+int main() {
+  printf("__ehdr_start=%p\n", &__ehdr_start);
+  printf("__executable_start=%p\n", &__executable_start);
+  printf("%.*s\n", (int)(__stop_foo - __start_foo), __start_foo);
+}
+EOF
+
+clang -fuse-ld=`pwd`/../mold -Wl,--image-base=0x40000 -o $t/exe $t/a.o $t/c.o
+$t/exe > $t/log
+
+grep -q '^__ehdr_start=0x40000$' $t/log
+grep -q '^__executable_start=0x40000$' $t/log
+grep -q '^section foo$' $t/log
+
+echo OK