diff --git a/ChangeLog b/ChangeLog
index c9d7dcb..f1f07c2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2024-01-31  Dirk Eddelbuettel  <edd@debian.org>
+
+	* src/align.cpp (align_func_period): Update signature of C-level
+	exported data.table function to DT_subsetDT
+	* DESCRIPTION (Imports): Set to data.table (>= 1.5.0)
+
 2023-09-20  Dirk Eddelbuettel  <edd@debian.org>
 
 	* .github/workflows/ci.yaml (jobs): Update to actions/checkout@v4
diff --git a/src/align.cpp b/src/align.cpp
index dbe3463..3abf22c 100644
--- a/src/align.cpp
+++ b/src/align.cpp
@@ -201,7 +201,7 @@ Rcpp::List align_func_duration(const nanotime::dtime* x,
   auto res = Rcpp::List::create();
   auto cols = makeIndex(2, XLENGTH(xdata)+1);
   typedef SEXP SUBSET_DT_FUN(SEXP,SEXP,SEXP); 
-  SUBSET_DT_FUN *subsetDT = (SUBSET_DT_FUN *) R_GetCCallable("data.table", "CsubsetDT" );
+  SUBSET_DT_FUN *subsetDT = (SUBSET_DT_FUN *) R_GetCCallable("data.table", "DT_subsetDT" );
                      
   size_t ix = 0, iy = 0;
 
@@ -276,7 +276,7 @@ Rcpp::List align_func_period(const nanotime::dtime* x,
   auto res = Rcpp::List::create();
   auto cols = makeIndex(2, XLENGTH(xdata)+1);
   typedef SEXP SUBSET_DT_FUN(SEXP,SEXP,SEXP); 
-  SUBSET_DT_FUN *subsetDT = (SUBSET_DT_FUN *) R_GetCCallable("data.table", "CsubsetDT" );
+  SUBSET_DT_FUN *subsetDT = (SUBSET_DT_FUN *) R_GetCCallable("data.table", "DT_subsetDT" );
                      
   size_t ix = 0, iy = 0;