diff --git a/fflas-ffpack/utils/args-parser.h b/fflas-ffpack/utils/args-parser.h
index 7f7d2184..32f2739f 100644
--- a/fflas-ffpack/utils/args-parser.h
+++ b/fflas-ffpack/utils/args-parser.h
@@ -72,7 +72,7 @@ namespace FFLAS {
     void parseArguments (int argc, char **argv, Argument *args, bool printDefaults = true);
 }
 
-void printHelpMessage (const char *program, Argument *args, bool printDefaults = false)
+inline void printHelpMessage (const char *program, Argument *args, bool printDefaults = false)
 {
     int i, l;
 
@@ -153,7 +153,7 @@ void printHelpMessage (const char *program, Argument *args, bool printDefaults =
 
 /* Find an argument in the argument list for a character */
 
-Argument *findArgument (Argument *args, char c)
+inline Argument *findArgument (Argument *args, char c)
 {
     int i;
 
@@ -174,7 +174,7 @@ Argument *findArgument (Argument *args, char c)
  *  @param instring list to be converted
  *  @return status message.
  */
-int getListArgs(std::list<int> & outlist, std::string & instring)
+inline int getListArgs(std::list<int> & outlist, std::string & instring)
 {
     int start = 0 ;
     int count = 0 ;
@@ -231,7 +231,7 @@ namespace FFLAS {
      * @param i    argument index
      * @return char* argument value
      */
-    char* getArgumentValue(int argc, char **argv,int i){
+    inline char* getArgumentValue(int argc, char **argv,int i){
         if (i+1 < argc) {
             return argv[i+1];
         } else {
@@ -240,7 +240,7 @@ namespace FFLAS {
         }
     }
 
-    void parseArguments (int argc, char **argv, Argument *args, bool printDefaults)
+    inline void parseArguments (int argc, char **argv, Argument *args, bool printDefaults)
     {
         int i;
         Argument *current;
@@ -345,7 +345,7 @@ namespace FFLAS {
     }
 
     /** writes the values of all arguments, preceded by the programName */
-    std::ostream& writeCommandString (std::ostream& os, Argument *args, const char* programName = nullptr)
+    inline std::ostream& writeCommandString (std::ostream& os, Argument *args, const char* programName = nullptr)
     {
         if (programName != nullptr)
             os << programName;