diff --git a/common/ttcn3float.hh b/common/ttcn3float.hh
index 74549a494479502338497ec60f17c9eccd173ed5..c3fa4e753ae583e4184d4b24782408f7fb3b32ad 100644
--- a/common/ttcn3float.hh
+++ b/common/ttcn3float.hh
@@ -23,7 +23,7 @@
    are displayed in exponential notation. */
 #define MAX_DECIMAL_FLOAT		1.0E+10
 
-#if __clpusplus < 201103L // signbit is a function in C++11, not a macro
+#if __cplusplus < 201103L // signbit is a function in C++11, not a macro
 
 #ifndef signbit
 // Probably Solaris.