A solid electrolytic capacitor that comprises a sintered porous anode, a dielectric layer that overlies the anode body, and a solid electrolyte overlying the dielectric layer is provided. The solid electrolyte comprises a conductive polymer and a nonionic surfactant having a hydrophilic/lipophilic balance (“HLB”) of from about 10 to about 20 and a molecular weight of from about 100 to about 10,000 grams per mole. The nonionic surfactant has a hydrophobic base and a hydrophilic chain that contains alkoxy moieties.