diff --git a/Makefile.am b/Makefile.am
index 74c292093e..1210c6d6b9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -34,7 +34,7 @@ install-data-local:
 	release=$(SPL_META_VERSION)-$(SPL_META_RELEASE); \
 	instdest=$(DESTDIR)/usr/src/spl-$$release/$(LINUX_VERSION); \
 	for instfile in $(noinst_HEADERS) module/$(LINUX_SYMBOLS); do \
-		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
+		$(INSTALL) -m 644 -D $$instfile $$instdest/$$instfile; \
 	done
 endif
 
diff --git a/include/Makefile.am b/include/Makefile.am
index 31acf7e998..9cca2840cb 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -19,7 +19,7 @@ install-data-local:
 	instdest=$(DESTDIR)/usr/src/spl-$$release/$(LINUX_VERSION); \
 	instfiles=`find . -name '*.h'`; \
         for instfile in $$instfiles; do \
-		$(INSTALL) -D $$instfile $$instdest/$$instfile; \
+		$(INSTALL) -m 644 -D $$instfile $$instdest/$$instfile; \
         done
 
 uninstall-local: