diff --git a/Makefile b/Makefile
index 6aa30a2..95777f6 100644
--- a/Makefile
+++ b/Makefile
@@ -79,7 +79,7 @@ $(SNAPPY_SOURCE_CONFIGURED): $(SNAPPY_GIT_UNPACKED)
 	cd $(SNAPPY_SRC_DIR) && ./autogen.sh && ./configure
 	touch $@
 
-jni-header: $(SNAPPY_SOURCE_CONFIGURED) $(BITSHUFFLE_UNPACKED) $(SRC)/org/xerial/snappy/SnappyNative.h $(SRC)/org/xerial/snappy/BitShuffleNative.h
+jni-header: $(SNAPPY_SOURCE_CONFIGURED) $(SRC)/org/xerial/snappy/SnappyNative.h $(SRC)/org/xerial/snappy/BitShuffleNative.h
 
 $(TARGET)/jni-classes/org/xerial/snappy/SnappyNative.class: $(SRC)/org/xerial/snappy/SnappyNative.java
 	@mkdir -p $(TARGET)/jni-classes
@@ -146,7 +146,6 @@ $(TARGET)/$(snappy-jar-version).jar:
 test: $(NATIVE_DLL)
 	$(SBT) test
 
-
 DOCKER_RUN_OPTS=--rm
 
 win32: jni-header
diff --git a/sbt b/sbt
index b853122..24b3318 100755
--- a/sbt
+++ b/sbt
@@ -101,7 +101,7 @@ init_default_option_file () {
 
 declare -r cms_opts="-XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC"
 declare -r jit_opts="-XX:ReservedCodeCacheSize=256m -XX:+TieredCompilation"
-declare -r default_jvm_opts_common="-Xms512m -Xmx1536m -Xss2m $jit_opts $cms_opts"
+declare -r default_jvm_opts_common="-Xms512m -Xmx2048m -Xss2m $jit_opts $cms_opts"
 declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
 declare -r latest_28="2.8.2"
 declare -r latest_29="2.9.3"