diff --git a/icu4c/source/common/unorm.cpp b/icu4c/source/common/unorm.cpp
index 7cd1f428078..ae8afc4aeda 100644
--- a/icu4c/source/common/unorm.cpp
+++ b/icu4c/source/common/unorm.cpp
@@ -41,6 +41,7 @@
 #include "umutex.h"
 #include "utrie.h"
 #include "unicode/uset.h"
+#include "udataswp.h"
 
 /*
  * Status of tailored normalization
diff --git a/icu4c/source/common/unormimp.h b/icu4c/source/common/unormimp.h
index e3fe602c246..a5e2637e0c7 100644
--- a/icu4c/source/common/unormimp.h
+++ b/icu4c/source/common/unormimp.h
@@ -26,6 +26,7 @@
 #include "unicode/uset.h"
 #include "utrie.h"
 #include "ustr_imp.h"
+#include "udataswp.h"
 
 /*
  * This new implementation of the normalization code loads its data from