He did not specify what the step would be, but in November, Turkey signed a letter of intent with France and Italy on cooperation in joint defence projects and Turkish defence ministry sources said at the time it was looking into a missile system based on EUROSAM's SAMP-T system.
Erdogan, for his part, said his country was sick of waiting to join the European Union after half a century.
Last year, a referendum also granted Mr Erdogan sweeping new powers - further straining his country's relationship with the EU.
'We have been seriously exhausted, my nation, too'.
High on the agenda will also be Turkey's relations with the European Union, which Ankara has sought to join for the la st 50 years in an epic membership saga that appeared to hit the buffers amid bitter rows in 2017.
The Turkish president said that signing of the defense deal was "very important step".
Macron has said he will also bring up the plight of jailed Turkish reporters during Friday's talks.
French president also said Turkey and France would continue to fight against terrorism and terror groups such as the PKK and Daesh.
Ties between Turkey and Europe worsened past year amid mass arrests and firings carried out by Erdogan's government following a July 2016 coup attempt.
About 50,000 people have been arrested and 110,000 others removed from public sector jobs in Turkey.
"Turkey is ruled by law", Erdogan said at the press conference.
A dozen demonstrators, mainly ethnic Kurds, later tried to reach the Elysee Palace, but police pushed them back onto a side street.
Erdogan had said earlier on Friday that he would discuss defence cooperation with North Atlantic Treaty Organisation ally France during his visit to Paris, highlighting an "important" step which Turkey would be taking with Eurosam without giving any details.
Macron said he raised the issues of media freedom and fundamental rights with his Turkish counterpart.
The Turkish government declared a state of emergency and launched a massive crackdown on Gulen's supporters in the aftermath of the coup attempt.
Macron added: 'We will find concrete and real solutions that will allow the few cases to be settled, and to settle what has sometimes been a misunderstanding, a harmful misunderstanding'.
The invitation to the Turkish strongman, who has presided over the arrest of tens of thousands of officials, academics, journalists and activists, has drawn criticism on the French left.