diff --git a/src/ipa/rpi/controller/rpi/alsc.cpp b/src/ipa/rpi/controller/rpi/alsc.cpp
index 8a205c60..8c0ae8eb 100644
--- a/src/ipa/rpi/controller/rpi/alsc.cpp
+++ b/src/ipa/rpi/controller/rpi/alsc.cpp
@@ -496,8 +496,8 @@ void resampleCalTable(const Array2D<double> &calTableIn,
 	 * Precalculate and cache the x sampling locations and phases to save
 	 * recomputing them on every row.
 	 */
-	int xLo[X], xHi[X];
-	double xf[X];
+	int *xLo = (int*)alloca(X), *xHi = (int*)alloca(X);
+	double *xf = (double*)alloca(X);
 	double scaleX = cameraMode.sensorWidth /
 			(cameraMode.width * cameraMode.scaleX);
 	double xOff = cameraMode.cropX / (double)cameraMode.sensorWidth;