diff --git a/Makefile.conf b/Makefile.conf
index fa3f751..77601f1 100644
--- a/Makefile.conf
+++ b/Makefile.conf
@@ -21,7 +21,7 @@ LDFLAGS+=-shared $(ENGINE_LIB) $(AD_LIB)
 
 LDLIBS=-lstdc++ -lpEpEngine -lpEpAdapter
 
-CXXFLAGS+=-fpermissive -fPIC -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/$(shell uname) $(AD_INC) $(ENGINE_INC)
+CXXFLAGS+=-fpermissive -fPIC -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/$(shell uname | tr A-Z a-z) $(AD_INC) $(ENGINE_INC)
 ifneq (,$(findstring g++,$(CXX)))
     CXXFLAGS+=-fdiagnostics-color=always
 else ifneq (,$(findstring clang,$(CXX)))