diff --git a/lib/libc/amd64/gen/ldexp.c b/lib/libc/amd64/gen/ldexp.c
index 9b8c1c4ea8ba..82af2076fd95 100644
--- a/lib/libc/amd64/gen/ldexp.c
+++ b/lib/libc/amd64/gen/ldexp.c
@@ -58,7 +58,7 @@ ldexp (double value, int exp)
 	double temp, texp, temp2;
 	texp = exp;
 #ifdef __GNUC__
-	asm ("fscale "
+	__asm ("fscale "
 		: "=u" (temp2), "=t" (temp)
 		: "0" (texp), "1" (value));
 #else