diff --git a/configure.ac b/configure.ac
index 5b363fb..9529572 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1733,19 +1733,23 @@ AC_SUBST(CCAS)
 
 # If the user provided its Yasm, check it seems functional
 MPIR_AS=""
-if test -z "$with_yasm"; then
-  echo "Looking for a system-wide yasm..."
-  MPIR_AS=`which yasm`
-  if test $? -ne 0; then
-    AC_MSG_ERROR([no system-wide yasm found])
-  fi
-else
-  MPIR_AS="$with_yasm"
-fi
-echo "Checking yasm..."
-if ! test -f "$MPIR_AS" || ! test -x "$MPIR_AS"; then
-  AC_MSG_ERROR([$MPIR_AS does not seem functional])
-fi
+case $host in
+  X86_PATTERN | X86_64_PATTERN)
+    if test -z "$with_yasm"; then
+      echo "Looking for a system-wide yasm..."
+      MPIR_AS=`which yasm`
+      if test $? -ne 0; then
+        AC_MSG_ERROR([no system-wide yasm found])
+      fi
+    else
+      MPIR_AS="$with_yasm"
+    fi
+    echo "Checking yasm..."
+    if ! test -f "$MPIR_AS" || ! test -x "$MPIR_AS"; then
+      AC_MSG_ERROR([$MPIR_AS does not seem functional])
+    fi
+    ;;
+esac
 AC_SUBST(MPIR_AS)
 
 # The C++ compiler, if desired.