diff --git a/dtool/src/interrogate/CMakeLists.txt b/dtool/src/interrogate/CMakeLists.txt
index f5404dc028..6d3752afae 100644
--- a/dtool/src/interrogate/CMakeLists.txt
+++ b/dtool/src/interrogate/CMakeLists.txt
@@ -55,4 +55,4 @@ target_link_libraries(interrogate
 add_executable(interrogate_module interrogate_module.cxx)
 target_link_libraries(interrogate_module
 	p3cppParser p3interrogatedb p3dconfig p3prc p3dtoolutil p3dtoolbase
-	p3pystub ${OPENSSL_LIBRARIES})
+	p3pystub ${_OPENSSL_LIBRARIES})