diff --git a/src/mont/fp_montgomery_reduce.c b/src/mont/fp_montgomery_reduce.c
index 822ace9..b8a194f 100644
--- a/src/mont/fp_montgomery_reduce.c
+++ b/src/mont/fp_montgomery_reduce.c
@@ -331,7 +331,7 @@ asm(                                 \
    " addc     16,16,18       \n\t"   \
    " addze    %0,17          \n\t"   \
    " stw      16,%1          \n\t"   \
-:"=r"(cy),"=m"(_c[0]):"0"(cy),"r"(mu),"r"(tmpm[0]),"1"(_c[0]):"16", "17", "18","%cc"); ++tmpm;
+:"=r"(cy),"=g"(_c[0]):"0"(cy),"r"(mu),"r"(tmpm[0]),"1"(_c[0]):"16", "17", "18","%cc"); ++tmpm;
 
 #define PROPCARRY                    \
 asm(                                 \
@@ -340,7 +340,7 @@ asm(                                 \
    " stw      16,%1         \n\t"    \
    " xor      %0,%0,%0      \n\t"    \
    " addze    %0,%0         \n\t"    \
-:"=r"(cy),"=m"(_c[0]):"0"(cy),"1"(_c[0]):"16","%cc");
+:"=r"(cy),"=g"(_c[0]):"0"(cy),"1"(_c[0]):"16","%cc");
 
 /******************************************************************/
 #elif defined(TFM_PPC64)