diff --git a/build/Makefile b/build/Makefile
index d3a8e44c0..43974d57d 100644
--- a/build/Makefile
+++ b/build/Makefile
@@ -39,7 +39,7 @@ ENGINE_DIR = $(F_KORE_DIR)/engine
 SUMMA_NRUTIL= \
         nrtype.f90 \
 		nr_utility.f90
-NRUTIL = $(patsubst %, $(NUMREC_DIR)/%, $(SUMMA_NRUTIL))
+NRUTIL = $(patsubst %, $(ENGINE_DIR)/%, $(SUMMA_NRUTIL))
 
 #
 # Numerical recipes procedures
@@ -47,7 +47,7 @@ NRUTIL = $(patsubst %, $(NUMREC_DIR)/%, $(SUMMA_NRUTIL))
 SUMMA_NRPROC= \
 		expIntegral.f90 \
 		spline_int.f90
-NRPROC = $(patsubst %, $(NUMREC_DIR)/%, $(SUMMA_NRPROC))
+NRPROC = $(patsubst %, $(ENGINE_DIR)/%, $(SUMMA_NRPROC))
 
 # Hook-up modules (set files and directory paths)
 SUMMA_HOOKUP= \
diff --git a/build/source/numrec/expIntegral.f90 b/build/source/engine/expIntegral.f90
similarity index 100%
rename from build/source/numrec/expIntegral.f90
rename to build/source/engine/expIntegral.f90
diff --git a/build/source/numrec/nr_utility.f90 b/build/source/engine/nr_utility.f90
similarity index 100%
rename from build/source/numrec/nr_utility.f90
rename to build/source/engine/nr_utility.f90
diff --git a/build/source/numrec/nrtype.f90 b/build/source/engine/nrtype.f90
similarity index 100%
rename from build/source/numrec/nrtype.f90
rename to build/source/engine/nrtype.f90
diff --git a/build/source/numrec/spline_int.f90 b/build/source/engine/spline_int.f90
similarity index 100%
rename from build/source/numrec/spline_int.f90
rename to build/source/engine/spline_int.f90