diff --git a/src/isl/Makefile.am b/src/isl/Makefile.am
index 6fd1da669a3..72f5460554f 100644
--- a/src/isl/Makefile.am
+++ b/src/isl/Makefile.am
@@ -44,6 +44,7 @@ libisl_la_CFLAGS = $(CFLAGS) -Wno-override-init
 
 libisl_la_SOURCES =                                     \
 	isl.c                                           \
+	isl.h                                           \
 	isl_format.c                                    \
 	isl_format_layout.c                             \
 	isl_gen4.c                                      \