diff --git a/test/integration/real_grammars.cc b/test/integration/real_grammars.cc
index 37465add..e842ee0c 100644
--- a/test/integration/real_grammars.cc
+++ b/test/integration/real_grammars.cc
@@ -20,6 +20,8 @@ static void assert_correct_tree_size(TSDocument *document, string content) {
 
 START_TEST
 
+if (TREE_SITTER_SEED == -1) return;
+
 vector<string> test_languages({
   "javascript",
   "json",
diff --git a/test/integration/test_grammars.cc b/test/integration/test_grammars.cc
index 9dbefcd8..f4ba6d92 100644
--- a/test/integration/test_grammars.cc
+++ b/test/integration/test_grammars.cc
@@ -9,6 +9,8 @@
 
 START_TEST
 
+if (TREE_SITTER_SEED == -1) return;
+
 string grammars_dir_path = join_path({"test", "fixtures", "test_grammars"});
 vector<string> test_languages = list_directory(grammars_dir_path);
 
diff --git a/test/test_helper.h b/test/test_helper.h
index 6947452b..0cb2d41c 100644
--- a/test/test_helper.h
+++ b/test/test_helper.h
@@ -5,6 +5,8 @@
 #include "tree_sitter/compiler.h"
 #include "tree_sitter/runtime.h"
 
+extern int TREE_SITTER_SEED;
+
 namespace tree_sitter {}
 
 using namespace std;
diff --git a/test/tests.cc b/test/tests.cc
index cb9d6595..303f9059 100644
--- a/test/tests.cc
+++ b/test/tests.cc
@@ -1,17 +1,18 @@
 #include "test_helper.h"
 #include "helpers/random_helpers.h"
 
+int TREE_SITTER_SEED = 0;
+
 int main(int argc, char *argv[]) {
-  int seed;
   const char *seed_env = getenv("TREE_SITTER_SEED");
   if (seed_env) {
-    seed = atoi(seed_env);
+    TREE_SITTER_SEED = atoi(seed_env);
   } else {
-    seed = get_time_as_seed();
+    TREE_SITTER_SEED = get_time_as_seed();
   }
 
-  printf("Random seed: %d\n", seed);
-  random_reseed(seed);
+  printf("Random seed: %d\n", TREE_SITTER_SEED);
+  random_reseed(TREE_SITTER_SEED);
 
   return bandit::run(argc, argv);
 }