diff --git a/fortran/eccodes_constants.h b/fortran/eccodes_constants.h
index 72383e471..736e3feab 100644
--- a/fortran/eccodes_constants.h
+++ b/fortran/eccodes_constants.h
@@ -1,3 +1,4 @@
+  integer, parameter,public :: CODES_ASSERTION_FAILURE                            = -79
   integer, parameter,public :: CODES_UNABLE_TO_COMPARE_ACCESSORS                  = -78
   integer, parameter,public :: CODES_TYPE_AND_VALUE_MISMATCH                      = -77
   integer, parameter,public :: CODES_TYPE_MISMATCH                                = -76
diff --git a/fortran/grib_api_constants.h b/fortran/grib_api_constants.h
index 0644110a9..f8ea7a226 100644
--- a/fortran/grib_api_constants.h
+++ b/fortran/grib_api_constants.h
@@ -1,3 +1,4 @@
+  integer, parameter,public :: GRIB_ASSERTION_FAILURE                             = -79
   integer, parameter,public :: GRIB_UNABLE_TO_COMPARE_ACCESSORS                   = -78
   integer, parameter,public :: GRIB_TYPE_AND_VALUE_MISMATCH                       = -77
   integer, parameter,public :: GRIB_TYPE_MISMATCH                                 = -76
diff --git a/src/eccodes.h b/src/eccodes.h
index 9509afe10..bded1a49c 100644
--- a/src/eccodes.h
+++ b/src/eccodes.h
@@ -1618,5 +1618,7 @@ Error codes returned by the eccodes functions.
 #define CODES_TYPE_AND_VALUE_MISMATCH		GRIB_TYPE_AND_VALUE_MISMATCH
 /** Unable to compare accessors */
 #define CODES_UNABLE_TO_COMPARE_ACCESSORS		GRIB_UNABLE_TO_COMPARE_ACCESSORS
+/** Assertion failure */
+#define CODES_ASSERTION_FAILURE		GRIB_ASSERTION_FAILURE
 /*! @}*/
 #endif
diff --git a/src/grib_api.h b/src/grib_api.h
index 7c830e495..cc0ddb5cc 100644
--- a/src/grib_api.h
+++ b/src/grib_api.h
@@ -1812,5 +1812,7 @@ Error codes returned by the grib_api functions.
 #define GRIB_TYPE_AND_VALUE_MISMATCH		-77
 /** Unable to compare accessors */
 #define GRIB_UNABLE_TO_COMPARE_ACCESSORS		-78
+/** Assertion failure */
+#define GRIB_ASSERTION_FAILURE		-79
 /*! @}*/
 #endif
diff --git a/src/grib_api_internal.h b/src/grib_api_internal.h
index 5a39ca0ba..d47de3a9b 100644
--- a/src/grib_api_internal.h
+++ b/src/grib_api_internal.h
@@ -1562,9 +1562,3 @@ typedef struct j2k_encode_helper
 
 #endif
 
-/* This part is automatically generated by ./errors.pl, do not edit */
-#ifndef grib_errors_internal_H
-#define grib_errors_internal_H
-/** Assertion failure */
-#define GRIB_ASSERTION_FAILURE 13
-#endif
diff --git a/src/grib_errors.cc b/src/grib_errors.cc
index 97b384c83..ac61a6154 100644
--- a/src/grib_errors.cc
+++ b/src/grib_errors.cc
@@ -91,7 +91,7 @@ static const char *errors[] = {
 "Type mismatch",		/* -76 GRIB_TYPE_MISMATCH */
 "Type and value mismatch",		/* -77 GRIB_TYPE_AND_VALUE_MISMATCH */
 "Unable to compare accessors",		/* -78 GRIB_UNABLE_TO_COMPARE_ACCESSORS */
-"Assertion failure",		/* 2 GRIB_ASSERTION_FAILURE */
+"Assertion failure",		/* -79 GRIB_ASSERTION_FAILURE */
 };
 
 #define NUMBER(a) sizeof(a)/sizeof(a[0])
diff --git a/src/grib_errors.txt b/src/grib_errors.txt
index 3d592da57..6019f6601 100644
--- a/src/grib_errors.txt
+++ b/src/grib_errors.txt
@@ -84,3 +84,4 @@ GRIB_NAME_MISMATCH                  Name mismatch
 GRIB_TYPE_MISMATCH                  Type mismatch
 GRIB_TYPE_AND_VALUE_MISMATCH        Type and value mismatch
 GRIB_UNABLE_TO_COMPARE_ACCESSORS    Unable to compare accessors
+GRIB_ASSERTION_FAILURE              Assertion failure
diff --git a/src/grib_errors_internal.txt b/src/grib_errors_internal.txt
index 3f88945d1..e69de29bb 100644
--- a/src/grib_errors_internal.txt
+++ b/src/grib_errors_internal.txt
@@ -1 +0,0 @@
-GRIB_ASSERTION_FAILURE              Assertion failure