A process for the production of a flexible polyurethane foam by reaction of a mixture of (a) at least one liquid organic polyisocyanate with (b) a polyol composition comprising from 5 to 98 percent by weight, based on the total amount of polyol composition (b), of a polyol compound having a functionality of 2 to 8 and a hydroxyl number of from 15 to 200 and the remaining from 2 to 95 percent by weight, based on the total amount of polyol composition (b), being composed of a polyol compound having a functionality of 2 to 8, a hydroxyl number of from 15 to 200 and containing at least one tertiary amine group providing autocatalytic function, which is an alkylene oxide adduct of an initiator having N-alkyl, N,N- dialkyl amino groups, or a mixture thereof, wherein the alkyl group is a C 1 to C 3 alkyl group, and wherein polyol does not contain at least one tertiary amine group providing autocatalytic function; in the presence of (c) at least one gelling amine catalyst, which is triethylenediamine; 3-hydroxymethyl quinuclidine, 3-quinuclidinol; imidazole; 1,2-dimethylimidazole; 1-methylimidazole; 2-methyl-2-imidazolone; 1,5- diazabicyclo (4.3.0)non-ene; 1,8-diazabicyclo (5.4.0)undec-7-ene; N, N'-dimethylpiperazine; 2,4-diamino-6-methyl-1,3,5-triazine; dimethyl benzylamine, N-methyl pyrrolidone, N-vinyl pyrrolidone, N-aminopropyl-pyrrolidine, N-methyl morpholine, N-ethyl morpholine, dimethylcyclohexylamine or a mixture thereof and being not more than 80 percent, on a molar basis, acid blocked; (d) water as a blowing agent; and (e) optionally additives, catalysts or auxiliary agents known per se for the production of polyurethane foams. (a) at least one liquid organic polyisocyanate with (b) a polyol composition comprising from 5 to 98 percent by weight, based on the total amount of polyol composition (b), of a polyol compound having a functionality of 2 to 8 and a hydroxyl number of from 15 to 200 and the remaining from 2 to 95 percent by weight, based on the total amount of polyol composition (b), being composed of a polyol compound having a functionality of 2 to 8, a hydroxyl number of from 15 to 200 and containing at least one tertiary amine group providing autocatalytic function, which is an alkylene oxide adduct of an initiator having N-alkyl, N,N- dialkyl amino groups, or a mixture thereof, wherein the alkyl group is a C 1 to C 3 alkyl group, and wherein polyol does not contain at least one tertiary amine group providing autocatalytic function; in the presence of (c) at least one gelling amine catalyst, which is triethylenediamine; 3-hydroxymethyl quinuclidine, 3-quinuclidinol; imidazole; 1,2-dimethylimidazole; 1-methylimidazole; 2-methyl-2-imidazolone; 1,5- diazabicyclo (4.3.0)non-ene; 1,8-diazabicyclo (5.4.0)undec-7-ene; N, N'-dimethylpiperazine; 2,4-diamino-6-methyl-1,3,5-triazine; dimethyl benzylamine, N-methyl pyrrolidone, N-vinyl pyrrolidone, N-aminopropyl-pyrrolidine, N-methyl morpholine, N-ethyl morpholine, dimethylcyclohexylamine or a mixture thereof and being not more than 80 percent, on a molar basis, acid blocked; (d) water as a blowing agent; and (e) optionally additives, catalysts or auxiliary agents known per se for the production of polyurethane foams.