diff --git a/dtool/src/interrogate/interrogate.cxx b/dtool/src/interrogate/interrogate.cxx
index fdd8b9a53a..4649cafa9f 100644
--- a/dtool/src/interrogate/interrogate.cxx
+++ b/dtool/src/interrogate/interrogate.cxx
@@ -305,6 +305,9 @@ predefine_macro(CPPParser& parser, const string& inoption) {
 
 int
 main(int argc, char **argv) {
+  // A call to pystub() to force libpystub.so to be linked in.
+  pystub();
+
   preprocess_argv(argc, argv);
   string command_line;
   int i;
diff --git a/dtool/src/interrogate/interrogate_module.cxx b/dtool/src/interrogate/interrogate_module.cxx
index eb7045ece9..fc5b46dd5a 100644
--- a/dtool/src/interrogate/interrogate_module.cxx
+++ b/dtool/src/interrogate/interrogate_module.cxx
@@ -238,6 +238,9 @@ int main(int argc, char *argv[]) {
   extern int optind;
   int flag;
 
+  // A call to pystub() to force libpystub.so to be linked in.
+  pystub();
+
   preprocess_argv(argc, argv);
   flag = getopt_long_only(argc, argv, short_options, long_options, NULL);
   while (flag != EOF) {