diff --git a/src/integrals.F90 b/src/integrals.F90
index c57a0a6..9728202 100644
--- a/src/integrals.F90
+++ b/src/integrals.F90
@@ -162,8 +162,8 @@ module integrals
 
 ! local variables
 !
-    integer         :: iret
-    real(kind=PREC) :: dvol
+    integer      :: iret
+    real(kind=8) :: dvol
 
 ! local arrays
 !
diff --git a/src/make.default b/src/make.default
index 937e6e7..155270f 100644
--- a/src/make.default
+++ b/src/make.default
@@ -22,12 +22,6 @@ SIGNALS      = N
 MPI          = N
 OMP          = N
 
-# precision flag:
-#
-#   PREC         - arithmetic precision: 4 for single, 8 for double precision
-#
-PREC         = 4
-
 # output data format
 #
 #   OUTPUT       - the format of output data; so far only HDF5
diff --git a/src/makefile b/src/makefile
index 6e81a89..119559e 100644
--- a/src/makefile
+++ b/src/makefile
@@ -104,10 +104,6 @@ ifneq ($(COMPRESS),NONE)
 FFLAGS  += -DCOMPRESS -D${COMPRESS}
 endif
 
-# precision
-#
-FFLAGS  += -DPREC=${PREC}
-
 # time integration method
 #
 FFLAGS  += -D${TIME}