diff --git a/Changes b/Changes
index 7944b2a17..c8e12875b 100644
--- a/Changes
+++ b/Changes
@@ -9,6 +9,8 @@ The contributors that suggested a given feature are shown in []. Thanks!
 
 ****  Fix error on bad interface name, bug1097. [Todd Strader]
 
+****  Fix type parameters with low optimization, bug1101. [Stefan Wallentowitz]
+
 
 * Verilator 3.888 2016-10-14
 
diff --git a/src/V3Param.cpp b/src/V3Param.cpp
index 091292c1e..26c814f4e 100644
--- a/src/V3Param.cpp
+++ b/src/V3Param.cpp
@@ -128,6 +128,10 @@ private:
 		    varp->user4(usedLetter[static_cast<int>(ch)]*256 + ch);
 		    usedLetter[static_cast<int>(ch)]++;
 		}
+	    } else if (AstParamTypeDType* typep = stmtp->castParamTypeDType()) {
+	        char ch = 'T';
+	        typep->user4(usedLetter[static_cast<int>(ch)]*256 + ch);
+	        usedLetter[static_cast<int>(ch)]++;
 	    }
 	}
     }