diff --git a/src/lte/model/lte-asn1-header.cc b/src/lte/model/lte-asn1-header.cc
index 095512525..767d30970 100644
--- a/src/lte/model/lte-asn1-header.cc
+++ b/src/lte/model/lte-asn1-header.cc
@@ -321,7 +321,14 @@ void Asn1Header::SerializeChoice (int numOptions, int selectedOption, bool isExt
 
 void Asn1Header::SerializeInteger (int n, int nmin, int nmax) const
 {
-  NS_ASSERT_MSG (nmin <= n && n <= nmax,
+  // The following is equivalent to:
+  //  NS_ASSERT_MSG (nmin <= n && n <= nmax,
+  //               "Integer " << n << " is outside range [" << nmin << ", " << nmax << "]");
+  // This is a workaround to gcc-7 aggressive optimization, see #346, and can be dropped
+  // once gcc-7 will not be anymore supported.
+  long int nComp = nmin;
+  nComp -= n;
+  NS_ASSERT_MSG (nComp <= 0 && n <= nmax,
                  "Integer " << n << " is outside range [" << nmin << ", " << nmax << "]");
 
   // Clause 11.5.3 ITU-T X.691