diff --git a/configure.ac b/configure.ac
index 8a8b7d949d..05d3e993c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1137,6 +1137,9 @@ main()
 			ac_cv_func___builtin_setjmp=no
 		])
 		],
+[emscripten*], [LIBS="-lm -lc $LIBS"
+		RUBY_APPEND_OPTIONS(LDFLAGS, -s ALLOW_MEMORY_GROWTH=1)
+		],
 [	LIBS="-lm $LIBS"])
 : ${ORIG_LIBS=$LIBS}