diff --git a/src/openalpr/constants.h b/src/openalpr/constants.h
index 6c07c40..cf1e3bb 100644
--- a/src/openalpr/constants.h
+++ b/src/openalpr/constants.h
@@ -31,10 +31,6 @@
   #define DEFAULT_CONFIG_FILE 	"/etc/openalpr/openalpr.conf"
 #endif
 
-#ifndef COMPILE_GPU
-  #define COMPILE_GPU 0 
-#endif
-
 #define ENV_VARIABLE_CONFIG_FILE "OPENALPR_CONFIG_FILE"
 
 #endif // OPENALPR_CONSTANTS_H
\ No newline at end of file
diff --git a/src/openalpr/detection/detectorcuda.cpp b/src/openalpr/detection/detectorcuda.cpp
index 5a0dde6..d5c980e 100644
--- a/src/openalpr/detection/detectorcuda.cpp
+++ b/src/openalpr/detection/detectorcuda.cpp
@@ -17,14 +17,14 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #include "detectorcuda.h"
 
-#if COMPILE_GPU
 
 using namespace cv;
 using namespace std;
 
+#ifdef COMPILE_GPU
+
 namespace alpr
 {
 
diff --git a/src/openalpr/detection/detectorcuda.h b/src/openalpr/detection/detectorcuda.h
index 4890f98..4eeefaa 100644
--- a/src/openalpr/detection/detectorcuda.h
+++ b/src/openalpr/detection/detectorcuda.h
@@ -20,7 +20,6 @@
 #ifndef OPENALPR_DETECTORCUDA_H
 #define	OPENALPR_DETECTORCUDA_H
 
-#if COMPILE_GPU
 
 #include <stdio.h>
 #include <iostream>
@@ -33,6 +32,10 @@
 #include "opencv2/gpu/gpu.hpp"
 
 #include "detector.h"
+#include "detectorcpu.h"
+
+
+#ifdef COMPILE_GPU
 
 namespace alpr
 {
diff --git a/src/openalpr/detection/detectorfactory.cpp b/src/openalpr/detection/detectorfactory.cpp
index cab0427..d8c1f0f 100644
--- a/src/openalpr/detection/detectorfactory.cpp
+++ b/src/openalpr/detection/detectorfactory.cpp
@@ -11,12 +11,13 @@ namespace alpr
     }
     else if (config->gpu_mode == 1)
     {
-      #if COMPILE_GPU
+      #ifdef COMPILE_GPU
       return new DetectorCUDA(config);
       #else
       std::cerr << "Error: GPU detector requested, but GPU extensions are not compiled.  " <<
               "Add COMPILE_GPU=1 to the compiler definitions to enable GPU compilation." <<
               std::endl;
+	  return new DetectorCPU(config);
       #endif
     }
   }