diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index 71fdd27..d7b69dc 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -404,8 +404,7 @@
 }
 __strong_alias(freopen64, freopen);
 
-int fclose(FILE* fp) {
-  CHECK_FP(fp);
+static int __FILE_close(FILE* fp) {
   if (fp->_flags == 0) {
     // Already freed!
     errno = EBADF;
@@ -440,7 +439,11 @@
   fp->_flags = 0;
   return r;
 }
-__strong_alias(pclose, fclose);
+
+int fclose(FILE* fp) {
+  CHECK_FP(fp);
+  return __FILE_close(fp);
+}
 
 int fileno_unlocked(FILE* fp) {
   CHECK_FP(fp);
@@ -459,6 +462,7 @@
 }
 
 void clearerr_unlocked(FILE* fp) {
+  CHECK_FP(fp);
   return __sclearerr(fp);
 }
 
@@ -1235,6 +1239,11 @@
   return fp;
 }
 
+int pclose(FILE* fp) {
+  CHECK_FP(fp);
+  return __FILE_close(fp);
+}
+
 namespace {
 
 namespace phony {