diff --git a/plugin/openssl/openssl.mk b/plugin/openssl/openssl.mk
index a090fc48f..6cd6fd54c 100644
--- a/plugin/openssl/openssl.mk
+++ b/plugin/openssl/openssl.mk
@@ -1,4 +1,4 @@
 openssl_SOURCES = openssl_provider.cc
 openssl_HEADERS = openssl_provider.h
 openssl_LDFLAGS = -lcrypto
-openssl_CXXFLAGS = -Iplugin/openssl/include -isystemplgun/openssl/include
+openssl_CXXFLAGS = -Iplugin/openssl/include