diff --git a/libphobos/ChangeLog b/libphobos/ChangeLog
index ad8f7ee278d3..babb6e55ba81 100644
--- a/libphobos/ChangeLog
+++ b/libphobos/ChangeLog
@@ -1,3 +1,8 @@
+2018-12-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* Makefile.am (AM_MAKEFLAGS): Pass CCASFLAGS, GDCFLAGS.
+	* Makefile.in: Regenerate.
+
 2018-11-28  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* Makefile.in: Rebuild.
diff --git a/libphobos/Makefile.am b/libphobos/Makefile.am
index 56965387d612..503ce6cee3ec 100644
--- a/libphobos/Makefile.am
+++ b/libphobos/Makefile.am
@@ -29,12 +29,14 @@ AM_MAKEFLAGS = \
 	"AR_FLAGS=$(AR_FLAGS)" \
 	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \
 	"CC_FOR_TARGET=$(CC_FOR_TARGET)" \
+	"CCASFLAGS=$(CCASFLAGS)" \
 	"CFLAGS=$(CFLAGS)" \
 	"CXXFLAGS=$(CXXFLAGS)" \
 	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" \
 	"CFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET)" \
 	"GDC_FOR_TARGET=$(GDC_FOR_TARGET)" \
 	"GDC=$(GDC)" \
+	"GDCFLAGS=$(GDCFLAGS)" \
 	"INSTALL=$(INSTALL)" \
 	"INSTALL_DATA=$(INSTALL_DATA)" \
 	"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" \
diff --git a/libphobos/Makefile.in b/libphobos/Makefile.in
index a54821d67997..3059196d75a8 100644
--- a/libphobos/Makefile.in
+++ b/libphobos/Makefile.in
@@ -345,12 +345,14 @@ AM_MAKEFLAGS = \
 	"AR_FLAGS=$(AR_FLAGS)" \
 	"CC_FOR_BUILD=$(CC_FOR_BUILD)" \
 	"CC_FOR_TARGET=$(CC_FOR_TARGET)" \
+	"CCASFLAGS=$(CCASFLAGS)" \
 	"CFLAGS=$(CFLAGS)" \
 	"CXXFLAGS=$(CXXFLAGS)" \
 	"CFLAGS_FOR_BUILD=$(CFLAGS_FOR_BUILD)" \
 	"CFLAGS_FOR_TARGET=$(CFLAGS_FOR_TARGET)" \
 	"GDC_FOR_TARGET=$(GDC_FOR_TARGET)" \
 	"GDC=$(GDC)" \
+	"GDCFLAGS=$(GDCFLAGS)" \
 	"INSTALL=$(INSTALL)" \
 	"INSTALL_DATA=$(INSTALL_DATA)" \
 	"INSTALL_PROGRAM=$(INSTALL_PROGRAM)" \