diff --git a/src/conform.c b/src/conform.c
index 49da7e3..37ea853 100644
--- a/src/conform.c
+++ b/src/conform.c
@@ -230,7 +230,8 @@ int conform_core(nifti_image *nim, const int outDims[3], const float outPixDims[
 	if (nVol != 1)
 		return 1;
 	//normalize voxel brightness 0..255
-	voxelIntensityScale(nim, f_high);
+	if (f_high > 0.0)
+		voxelIntensityScale(nim, f_high);
 	//estimate spatial transform
 	const int inDims[3] = {(int)nim->nx, (int)nim->ny, (int)nim->nz};
 	mat44 in_affine = f642f32mat44(&nim->sto_xyz);
diff --git a/src/niimath.c b/src/niimath.c
index 81c2793..0cb81e8 100644
--- a/src/niimath.c
+++ b/src/niimath.c
@@ -61,7 +61,7 @@
 	#define kOS "Windows"
 #endif
 
-#define kMTHdate "v1.0.20240908"
+#define kMTHdate "v1.0.20240911"
 #define kMTHvers kMTHdate kOMPsuf kCCsuf
 
 #ifdef NII2MESH