diff --git a/mozglue/interposers/pthread_atfork_interposer.cpp b/mozglue/interposers/pthread_atfork_interposer.cpp
index 3ed7635e0ec7..9312a76775a1 100644
--- a/mozglue/interposers/pthread_atfork_interposer.cpp
+++ b/mozglue/interposers/pthread_atfork_interposer.cpp
@@ -126,6 +126,9 @@ MFBT_API int pthread_atfork(void (*aPrefork)(void),
 #  if defined(LIBC_GLIBC)
                               ,
                               dso_handle
+#  else
+                              ,
+                              (void*)(1)
 #  endif
                               )
            ? 0