diff --git a/src/basic_api.cc b/src/basic_api.cc
index 433408c..b79a007 100644
--- a/src/basic_api.cc
+++ b/src/basic_api.cc
@@ -1,6 +1,6 @@
 #include <pEp/keymanagement.h>
 #include <pEp/blacklist.h>
-#include <pEp/Sync.h>
+#include <pEp/sync.h>
 
 #ifndef ANDROID
 #include <string.h>
diff --git a/src/org_pEp_jniadapter_AbstractEngine.cc b/src/org_pEp_jniadapter_AbstractEngine.cc
index a358c1b..149aa14 100644
--- a/src/org_pEp_jniadapter_AbstractEngine.cc
+++ b/src/org_pEp_jniadapter_AbstractEngine.cc
@@ -6,7 +6,7 @@
 #include <pthread.h>
 #include <pEp/keymanagement.h>
 #include <pEp/message_api.h>
-#include <pEp/Sync.h>
+#include <pEp/sync.h>
 
 #include "throw_pEp_exception.hh"
 #include "jniutils.hh"