diff --git a/src/Backends/Helmholtz/ExcessHEFunction.h b/src/Backends/Helmholtz/ExcessHEFunction.h
index 361cd5e8..c7b304e8 100644
--- a/src/Backends/Helmholtz/ExcessHEFunction.h
+++ b/src/Backends/Helmholtz/ExcessHEFunction.h
@@ -2,7 +2,7 @@
 #define EXCESSHE_FUNCTIONS_H
 
 #include <vector>
-#include "Fluids/CoolPropFluid.h"
+#include "CoolPropFluid.h"
 
 namespace CoolProp{
 
diff --git a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h
index 4c9ec4f2..e2f219a9 100644
--- a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h
+++ b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.h
@@ -3,7 +3,7 @@
 #define HELMHOLTZEOSMIXTUREBACKEND_H_
 
 #include "AbstractState.h"
-#include "Fluids/CoolPropFluid.h"
+#include "CoolPropFluid.h"
 #include "ReducingFunctions.h"
 #include "ExcessHEFunction.h"
 #include "Solvers.h"
diff --git a/src/Backends/Helmholtz/ReducingFunctions.h b/src/Backends/Helmholtz/ReducingFunctions.h
index 7e5f64ff..4ccc74ed 100644
--- a/src/Backends/Helmholtz/ReducingFunctions.h
+++ b/src/Backends/Helmholtz/ReducingFunctions.h
@@ -2,7 +2,7 @@
 #define DEPARTURE_FUNCTIONS_H
 
 #include <vector>
-#include "Fluids/CoolPropFluid.h"
+#include "CoolPropFluid.h"
 
 namespace CoolProp{