diff --git a/src/parallel_io.c b/src/parallel_io.c
index 0720c7cbd3c965e5be0b3f5f30ac30f5e33c661d..cd752822e8038448fc4e6664c4a42b9b71bc7033 100644
--- a/src/parallel_io.c
+++ b/src/parallel_io.c
@@ -40,7 +40,6 @@
 #include "engine.h"
 #include "error.h"
 #include "hydro_properties.h"
-#include "kernel_hydro.h"
 #include "part.h"
 #include "units.h"
 
diff --git a/src/serial_io.c b/src/serial_io.c
index 7c7afd1a27dfab7abdf8afeb68df27355083715c..ece269cc37ba009074a2745da1069099b355a686 100644
--- a/src/serial_io.c
+++ b/src/serial_io.c
@@ -40,7 +40,6 @@
 #include "engine.h"
 #include "error.h"
 #include "hydro_properties.h"
-#include "kernel_hydro.h"
 #include "part.h"
 #include "units.h"
 
diff --git a/src/single_io.c b/src/single_io.c
index ff437ef137fba2118072824add29995f890726be..ae67445b2d4e34d561611a0fa6ca3322d02a55ed 100644
--- a/src/single_io.c
+++ b/src/single_io.c
@@ -39,7 +39,6 @@
 #include "engine.h"
 #include "error.h"
 #include "hydro_properties.h"
-#include "kernel_hydro.h"
 #include "part.h"
 #include "units.h"