diff --git a/lib/Alembic/Abc/Foundation.h b/lib/Alembic/Abc/Foundation.h
index 9760c49..fbab6a0 100644
--- a/lib/Alembic/Abc/Foundation.h
+++ b/lib/Alembic/Abc/Foundation.h
@@ -40,11 +40,11 @@
 #include <Alembic/AbcCoreAbstract/All.h>
 #include <Alembic/Util/All.h>
 
-#include <ImathVec.h>
-#include <ImathBox.h>
-#include <ImathMatrix.h>
-#include <ImathQuat.h>
-#include <ImathColor.h>
+#include <OpenEXR/ImathVec.h>
+#include <OpenEXR/ImathBox.h>
+#include <OpenEXR/ImathMatrix.h>
+#include <OpenEXR/ImathQuat.h>
+#include <OpenEXR/ImathColor.h>
 
 #include <iostream>
 #include <string>
diff --git a/lib/Alembic/AbcGeom/Foundation.h b/lib/Alembic/AbcGeom/Foundation.h
index 301efc3..2bb0f6b 100644
--- a/lib/Alembic/AbcGeom/Foundation.h
+++ b/lib/Alembic/AbcGeom/Foundation.h
@@ -39,8 +39,8 @@
 
 #include <Alembic/Abc/All.h>
 
-#include <ImathMatrixAlgo.h>
-#include <ImathEuler.h>
+#include <OpenEXR/ImathMatrixAlgo.h>
+#include <OpenEXR/ImathEuler.h>
 
 
 namespace Alembic {
diff --git a/lib/Alembic/Util/Foundation.h b/lib/Alembic/Util/Foundation.h
index d7f40dd..a41bb97 100644
--- a/lib/Alembic/Util/Foundation.h
+++ b/lib/Alembic/Util/Foundation.h
@@ -63,7 +63,7 @@
 
 #include <memory>
 
-#include <half.h>
+#include <OpenEXR/half.h>
 
 #include <iomanip>
 #include <iostream>