diff --git a/ecal/core/src/ecal_defs.h.in b/ecal/core/src/ecal_defs.h.in
index c792a26d1..e5119582b 100644
--- a/ecal/core/src/ecal_defs.h.in
+++ b/ecal/core/src/ecal_defs.h.in
@@ -39,6 +39,6 @@
 #define ECAL_INSTALL_LIB_DIR     "@eCAL_install_lib_dir@"
 #define ECAL_INSTALL_CONFIG_DIR  "@eCAL_install_config_dir@"
 #define ECAL_INSTALL_INCLUDE_DIR "@eCAL_install_include_dir@"
-#define ECAL_INSTALL_PREFIX      "@CMAKE_INSTALL_PREFIX@"
+#define ECAL_INSTALL_PREFIX      ""
 
 #endif // ecal_defs_h_included