diff --git a/fuzz/compress.cc b/fuzz/compress.cc
index b9f3b20..7c94087 100644
--- a/fuzz/compress.cc
+++ b/fuzz/compress.cc
@@ -36,7 +36,7 @@
 
 #define NUMTESTS  7
 /* Private flag that triggers different TurboJPEG API behavior when fuzzing */
-#define TJFLAG_FUZZING  (1 << 31)
+#define TJFLAG_FUZZING  (1 << 30)
 
 
 struct test {
diff --git a/fuzz/compress_yuv.cc b/fuzz/compress_yuv.cc
index 2dc8135..613f550 100644
--- a/fuzz/compress_yuv.cc
+++ b/fuzz/compress_yuv.cc
@@ -36,7 +36,7 @@
 
 #define NUMTESTS  6
 /* Private flag that triggers different TurboJPEG API behavior when fuzzing */
-#define TJFLAG_FUZZING  (1 << 31)
+#define TJFLAG_FUZZING  (1 << 30)
 
 
 struct test {
diff --git a/turbojpeg.c b/turbojpeg.c
index 0bbdb88..aebef0a 100644
--- a/turbojpeg.c
+++ b/turbojpeg.c
@@ -206,7 +206,7 @@
 
 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 /* Private flag that triggers different TurboJPEG API behavior when fuzzing */
-#define TJFLAG_FUZZING  (1 << 31)
+#define TJFLAG_FUZZING  (1 << 30)
 #endif
 
 #define GET_INSTANCE(handle) \