diff --git a/scripts/test/Makefile b/scripts/test/Makefile
index ffc0c90a..cdff5846 100644
--- a/scripts/test/Makefile
+++ b/scripts/test/Makefile
@@ -21,7 +21,9 @@ SAMPLE_DIR = ../../samples
 GTEST_MAIN_CC = ../../src/gtest_main.cc
 
 # Flags passed to the preprocessor.
-CPPFLAGS += -I$(FUSED_GTEST_DIR)
+# We have no idea here whether pthreads is available in the system, so
+# disable its use.
+CPPFLAGS += -I$(FUSED_GTEST_DIR) -DGTEST_HAS_PTHREAD=0
 
 # Flags passed to the C++ compiler.
 CXXFLAGS += -g