diff --git a/Makefile b/Makefile
index 3ab260f..8504f8c 100644
--- a/Makefile
+++ b/Makefile
@@ -27,15 +27,17 @@ library: $(TARGET)
 $(TARGET): $(LIBOBJ)
 	$(CXX) $(LIBFLAGS) -o $(TARGET) $(LIBOBJ)
 
-
 %.o: %.cpp $(PARSERFILES)
 	$(CXX) $(CFLAGS) -c -o $@ $<
 
-$(SRCPARSER)/bison_parser.cpp: parser
-$(SRCPARSER)/flex_lexer.cpp: parser
+$(SRCPARSER)/bison_parser.cpp:
+	make -C $(SRCPARSER)/ bison_parser.cpp
+
+$(SRCPARSER)/flex_lexer.cpp:
+	make -C $(SRCPARSER)/ flex_lexer.cpp
 
 parser:
-	make -C $(SRCPARSER)/
+	make -C $(SRCPARSER) all
 
 clean:
 	rm -f $(TARGET)
@@ -49,6 +51,8 @@ cleanall: clean cleanparser
 
 install:
 	cp $(TARGET) $(INSTALL)/lib/$(TARGET)
+	cp -r src $(INSTALL)/include/hsql
+	find $(INSTALL)/include/hsql -not -name '*.h' -type f | xargs rm
 
 format:
 	astyle --options=astyle.options $(ALLLIB)
diff --git a/README.md b/README.md
index 5f8ea54..8056e5e 100644
--- a/README.md
+++ b/README.md
@@ -36,7 +36,7 @@ To use the SQL parser in your own projects you simply have to follow these few s
 
 First step to extending this parser is cloning the repository `git clone git@github.com:hyrise/sql-parser.git` and making sure everything works by running the following steps:
 
-``` 
+```bash
 make parser   # builds the bison parser and flex lexer
 make library  # builds the libsqlparser.so
 make test     # runs the tests with the library
@@ -44,7 +44,7 @@ make test     # runs the tests with the library
 
 Rerun these steps whenever you change part of the parse. To execute the entire pipeline automatically you can run:
 
-```
+```bash
 make cleanall  # cleans the parser build and library build
 make test      # build parser, library and runs the tests
 ```
diff --git a/example/example.cpp b/example/example.cpp
index 91e5d17..aa17b82 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -19,6 +19,10 @@ int main(int argc, char *argv[]) {
     hsql::SQLParserResult* result = hsql::SQLParser::parseSQLString(query);
 
     // check whether the parsing was successful
+    if (!result) {
+        return -1;
+    }
+
     if (result->isValid()) {
         printf("Parsed successfully!\n");
         printf("Number of statements: %lu\n", result->size());
diff --git a/test/test.sh b/test/test.sh
index 73b3262..b9d2dc1 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -32,6 +32,7 @@ fi
 printf "\n${GREEN}Running memory leak checks...${NC}\n"
 valgrind --leak-check=full --error-exitcode=200 --log-fd=3 \
   ./bin/sql_tests -f "test/valid_queries.sql" 3>&1 >/dev/null 2>/dev/null
+MEM_LEAK_RET=$?
 
 if [ $MEM_LEAK_RET -ne 200 ]; then
 	printf "${GREEN}Memory leak check succeeded!${NC}\n"