diff --git a/.gitignore b/.gitignore
index a9a21d17..c5182460 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ config.log
 insar.log
 isce.log
 .ipynb_checkpoints
+build
\ No newline at end of file
diff --git a/contrib/Snaphu/src/snaphu_util.c b/contrib/Snaphu/src/snaphu_util.c
index bb1422d7..93e82fa2 100644
--- a/contrib/Snaphu/src/snaphu_util.c
+++ b/contrib/Snaphu/src/snaphu_util.c
@@ -575,8 +575,8 @@ signed char ValidDataArray(float **arr, long nrow, long ncol){
  */
 signed char IsFinite(double d){
 
-  return(finite(d));
-  /* return(isfinite(d)); */
+  /* not available on arm64 return(finite(d)); */
+  return(isfinite(d));
   /* return(!(isnan(d) || isinf(d))); */
   /* return(TRUE) */
 }
diff --git a/contrib/alos2filter/src/psfilt1.c b/contrib/alos2filter/src/psfilt1.c
index 3051f1fa..4f3e8a78 100644
--- a/contrib/alos2filter/src/psfilt1.c
+++ b/contrib/alos2filter/src/psfilt1.c
@@ -522,8 +522,8 @@ void stop_timing()
  */
 signed char IsFinite(double d){
 
-  return(finite(d));
-  /* return(isfinite(d)); */
+  /* not available on arm64 return(finite(d)); */
+  return(isfinite(d));
   /* return(!(isnan(d) || isinf(d))); */
   /* return(TRUE) */
 }