diff --git a/src/lib/gnat/Makefile.inc b/src/lib/gnat/Makefile.inc
index 9c68624947..5c4c510f7e 100644
--- a/src/lib/gnat/Makefile.inc
+++ b/src/lib/gnat/Makefile.inc
@@ -24,6 +24,7 @@ ADAFLAGS_libgnat-$(1) := \
 	-gnatg \
 	-gnatpg \
 	-I$$(src)/lib/gnat/ \
+	$$(CFLAGS_$(1)) \
 
 libgnat-$(1)-y += a-unccon.ads
 libgnat-$(1)-y += ada.ads
diff --git a/toolchain.inc b/toolchain.inc
index d9b11f0c63..936eb14c7f 100644
--- a/toolchain.inc
+++ b/toolchain.inc
@@ -129,7 +129,7 @@ OBJDUMP_$(1) := $(OBJDUMP_$(2))
 STRIP_$(1) := $(STRIP_$(2))
 READELF_$(1) := $(READELF_$(2))
 CFLAGS_$(1) = $$(CFLAGS_common) $$(CFLAGS_$(2))
-ADAFLAGS_$(1) = --RTS=$$(obj)/libgnat-$(2)/ $$(ADAFLAGS_common) $$(ADAFLAGS_$(2))
+ADAFLAGS_$(1) = --RTS=$$(obj)/libgnat-$(2)/ $$(ADAFLAGS_common) $$(CFLAGS_$(2))
 CPPFLAGS_$(1) = $$(CPPFLAGS_common) $$(CPPFLAGS_$(2)) -D__ARCH_$(2)__
 COMPILER_RT_$(1) := $$(COMPILER_RT_$(2))
 COMPILER_RT_FLAGS_$(1) := $$(COMPILER_RT_FLAGS_$(2))