diff --git a/src/gmio_core/internal/error_check.c b/src/gmio_core/internal/error_check.c
index d3db92e..5969ec5 100644
--- a/src/gmio_core/internal/error_check.c
+++ b/src/gmio_core/internal/error_check.c
@@ -29,6 +29,7 @@
 
 #include "error_check.h"
 
+#include "locale_utils.h"
 #include "../error.h"
 #include "../memblock.h"
 
@@ -48,3 +49,10 @@ bool gmio_check_memblock_size(
         *error = GMIO_ERROR_INVALID_MEMBLOCK_SIZE;
     return gmio_no_error(*error);
 }
+
+bool gmio_check_lc_numeric(int *error)
+{
+    if (!gmio_lc_numeric_is_C())
+        *error = GMIO_ERROR_BAD_LC_NUMERIC;
+    return gmio_no_error(*error);
+}
diff --git a/src/gmio_core/internal/error_check.h b/src/gmio_core/internal/error_check.h
index 4d7ef52..adf0025 100644
--- a/src/gmio_core/internal/error_check.h
+++ b/src/gmio_core/internal/error_check.h
@@ -39,4 +39,8 @@ bool gmio_check_memblock(
 bool gmio_check_memblock_size(
         int* error, const struct gmio_memblock* mblock, size_t minsize);
 
+/*! Checks gmio_lc_numeric_is_C(), if false sets \p *error to
+ *  \c GMIO_ERROR_BAD_LC_NUMERIC*/
+bool gmio_check_lc_numeric(int* error);
+
 #endif /* GMIO_INTERNAL_ERROR_CHECK_H */
diff --git a/src/gmio_core/internal/locale_utils.c b/src/gmio_core/internal/locale_utils.c
index b77ed76..40bc8d1 100644
--- a/src/gmio_core/internal/locale_utils.c
+++ b/src/gmio_core/internal/locale_utils.c
@@ -49,13 +49,6 @@ bool gmio_lc_numeric_is_C()
             || gmio_ascii_stricmp(lc, "POSIX") == 0);
 }
 
-bool gmio_check_lc_numeric(int *error)
-{
-    if (!gmio_lc_numeric_is_C())
-        *error = GMIO_ERROR_BAD_LC_NUMERIC;
-    return gmio_no_error(*error);
-}
-
 static char global_lc_numeric[64] = {0};
 
 void gmio_lc_numeric_save()
diff --git a/src/gmio_core/internal/locale_utils.h b/src/gmio_core/internal/locale_utils.h
index fd27838..f797f5d 100644
--- a/src/gmio_core/internal/locale_utils.h
+++ b/src/gmio_core/internal/locale_utils.h
@@ -34,9 +34,5 @@ const char* gmio_lc_numeric();
 /*! Returns result of case-insensitive test <tt>LC_NUMERIC == "C|POSIX"</tt> */
 bool gmio_lc_numeric_is_C();
 
-/*! Checks gmio_lc_numeric_is_C(), if false sets \p *error to
- *  \c GMIO_ERROR_BAD_LC_NUMERIC*/
-bool gmio_check_lc_numeric(int* error);
-
 void gmio_lc_numeric_save();
 void gmio_lc_numeric_restore();
diff --git a/src/gmio_stl/internal/stla_write.c b/src/gmio_stl/internal/stla_write.c
index 59ec59e..bd5add7 100644
--- a/src/gmio_stl/internal/stla_write.c
+++ b/src/gmio_stl/internal/stla_write.c
@@ -40,7 +40,6 @@
 #include "../../gmio_core/internal/helper_memblock.h"
 #include "../../gmio_core/internal/helper_stream.h"
 #include "../../gmio_core/internal/helper_task_iface.h"
-#include "../../gmio_core/internal/locale_utils.h"
 #include "../../gmio_core/internal/min_max.h"
 #include "../../gmio_core/internal/safe_cast.h"
 
diff --git a/src/gmio_stl/stla_read.c b/src/gmio_stl/stla_read.c
index bb8cfff..38448ad 100644
--- a/src/gmio_stl/stla_read.c
+++ b/src/gmio_stl/stla_read.c
@@ -37,10 +37,10 @@
 
 #include "../gmio_core/error.h"
 #include "../gmio_core/internal/c99_stdio_compat.h"
+#include "../gmio_core/internal/error_check.h"
 #include "../gmio_core/internal/helper_memblock.h"
 #include "../gmio_core/internal/helper_stream.h"
 #include "../gmio_core/internal/helper_task_iface.h"
-#include "../gmio_core/internal/locale_utils.h"
 #include "../gmio_core/internal/min_max.h"
 #include "../gmio_core/internal/safe_cast.h"
 #include "../gmio_core/internal/stringstream.h"