diff --git a/packages/runtime/src/scr_lib.c b/packages/runtime/src/scr_lib.c
index df36f063e2..ad42a5824c 100644
--- a/packages/runtime/src/scr_lib.c
+++ b/packages/runtime/src/scr_lib.c
@@ -225,15 +225,16 @@ static void scr_module_registry_cleanup(void) {
  * own cleanup only when the value is first materialized.  That is equivalent
  * at process exit and retains the RC-audit cleanup guarantee for the values a
  * program actually observes. */
-#if defined(__linux__)
+#if defined(__linux__) && !defined(SCR_LIB)
 /* The heap census of a program built with SCRIPTC_HEAP_CENSUS
  * (heap-census.ts) writes its counters at exit, from here and from
- * scr_process_exit; every other build leaves the weak reference null. */
+ * scr_process_exit; every other program leaves the weak reference null.
+ * Libraries have no census, and their archives declare no such symbol. */
 extern void scr_census_write(void) __attribute__((weak));
 #endif
 
 static void scr_lib_cleanup(void) {
-#if defined(__linux__)
+#if defined(__linux__) && !defined(SCR_LIB)
   if (scr_census_write != NULL) scr_census_write();
 #endif
   scr_module_registry_cleanup();
@@ -2147,7 +2148,9 @@ void scr_process_exit(double code) {
   fflush(stdout);
 #if defined(__linux__)
   if (__llvm_profile_write_file != NULL) (void)__llvm_profile_write_file();
+#ifndef SCR_LIB
   if (scr_census_write != NULL) scr_census_write();
+#endif
   scr_detach_teardown();
 #endif
   _Exit((int)code);