diff --git a/libports/lib/mk/gmp.inc b/libports/lib/mk/gmp.inc
index b0a02e8fe3..a865fcc520 100644
--- a/libports/lib/mk/gmp.inc
+++ b/libports/lib/mk/gmp.inc
@@ -4,6 +4,9 @@ ifeq ($(wildcard $(GMP_DIR)),)
 REQUIRES += prepare_gmp
 endif
 
+# gmp depends on gmp-mpn which requires 32bit by now
+REQUIRES = x86_32
+
 include $(REP_DIR)/lib/import/import-gmp.mk
 
 LIBS += libc
diff --git a/libports/lib/mk/mpfr.mk b/libports/lib/mk/mpfr.mk
index 5538346770..6d1aa936df 100644
--- a/libports/lib/mk/mpfr.mk
+++ b/libports/lib/mk/mpfr.mk
@@ -4,8 +4,8 @@ ifeq ($(wildcard $(MPFR_DIR)),)
 REQUIRES += prepare_mpfr
 endif
 
-# mpfr depends on gmp, which is only supported on x86 yet
-REQUIRES += x86
+# mpfr depends on gmp, which is only supported on x86_32 yet
+REQUIRES += x86_32
 
 LIBS      = libc gmp
 CC_OPT   += -DHAVE_STDARG -DHAVE_VA_COPY -DHAVE_INTTYPES_H