diff --git a/openbr/plugins/gallery.cpp b/openbr/plugins/gallery.cpp
index 08e3a65..02b0061 100644
--- a/openbr/plugins/gallery.cpp
+++ b/openbr/plugins/gallery.cpp
@@ -313,15 +313,15 @@ class utGallery : public BinaryGallery
             width = t.file.get<uint32_t>("Width", 0);
             height = t.file.get<uint32_t>("Height", 0);
         }
-        const double label = t.file.get<double>("Label", 0);
+        const uint32_t label = t.file.get<uint32_t>("Label", 0);
 
         gallery.write(imageID);
-        gallery.write((const char*) &algorithmID, sizeof(uint32_t));
+        gallery.write((const char*) &algorithmID, sizeof(int32_t));
         gallery.write((const char*) &x          , sizeof(uint32_t));
         gallery.write((const char*) &y          , sizeof(uint32_t));
         gallery.write((const char*) &width      , sizeof(uint32_t));
         gallery.write((const char*) &height     , sizeof(uint32_t));
-        gallery.write((const char*) &label      , sizeof(double));
+        gallery.write((const char*) &label      , sizeof(uint32_t));
 
         const uint32_t urlSize = url.size() + 1;
         gallery.write((const char*) &urlSize, sizeof(uint32_t));
diff --git a/openbr/universal_template.cpp b/openbr/universal_template.cpp
index 7b141db..79731ac 100644
--- a/openbr/universal_template.cpp
+++ b/openbr/universal_template.cpp
@@ -8,7 +8,7 @@
 
 #include "universal_template.h"
 
-br_utemplate br_new_utemplate(const int8_t *imageID, int32_t algorithmID, size_t x, size_t y, size_t width, size_t height, double label, const char *url, const char *fv, uint32_t fvSize)
+br_utemplate br_new_utemplate(const char *imageID, int32_t algorithmID, uint32_t x, uint32_t y, uint32_t width, uint32_t height, uint32_t label, const char *url, const char *fv, uint32_t fvSize)
 {
     const uint32_t urlSize = strlen(url) + 1;
     br_utemplate utemplate = (br_utemplate) malloc(sizeof(br_universal_template) + urlSize + fvSize);
diff --git a/openbr/universal_template.h b/openbr/universal_template.h
index 173d153..979871d 100644
--- a/openbr/universal_template.h
+++ b/openbr/universal_template.h
@@ -41,8 +41,7 @@ struct br_universal_template
     uint32_t y;      /*!< region of interest vertical offset (pixels). */
     uint32_t width;  /*!< region of interest horizontal size (pixels). */
     uint32_t height; /*!< region of interest vertical size (pixels). */
-    double label; /*!< classification/regression supervised training class,
-                       or manually annotated ground truth. */
+    uint32_t label; /*!< supervised training class or manually annotated ground truth. */
     uint32_t urlSize; /*!< length of null-terminated URL at the beginning of _data_,
                            including the null-terminator character. */
     uint32_t fvSize; /*!< length of the feature vector after the URL in _data_. */
@@ -58,7 +57,7 @@ typedef const struct br_universal_template *br_const_utemplate;
  * \brief br_universal_template constructor.
  * \see br_free_utemplate
  */
-BR_EXPORT br_utemplate br_new_utemplate(const int8_t *imageID, int32_t algorithmID, size_t x, size_t y, size_t width, size_t height, double label, const char *url, const char *fv, uint32_t fvSize);
+BR_EXPORT br_utemplate br_new_utemplate(const char *imageID, int32_t algorithmID, uint32_t x, uint32_t y, uint32_t width, uint32_t height, uint32_t label, const char *url, const char *fv, uint32_t fvSize);
 
 /*!
  * \brief br_universal_template destructor.