diff --git a/preprocessor/DynareBison.yy b/preprocessor/DynareBison.yy
index b9c68306d3264af2fa1d0f0b811167da38838ac0..b775d1466bd735ae33c8206a66153eacdf88a158 100644
--- a/preprocessor/DynareBison.yy
+++ b/preprocessor/DynareBison.yy
@@ -100,7 +100,7 @@ class ParsingDriver;
 %token HISTVAL HP_FILTER HP_NGRID
 %token INITVAL INITVAL_FILE
 %token <string_val> INT_NUMBER
-%token INV_GAMMA1_PDF INV_GAMMA2_PDF IRF
+%token INV_GAMMA_PDF INV_GAMMA1_PDF INV_GAMMA2_PDF IRF
 %token KALMAN_ALGO KALMAN_TOL
 %token LAPLACE LCC_COMPILER LIK_ALGO LIK_INIT LINEAR LOAD_MH_FILE LOGLINEAR LU MARKOWITZ MAX
 %token METHOD MH_DROP MH_INIT_SCALE MH_JSCALE MH_MODE MH_NBLOCKS MH_REPLIC MH_RECOVER MIN
@@ -921,6 +921,8 @@ prior : BETA_PDF
         { $$ = new string("2"); }
       | NORMAL_PDF
         { $$ = new string("3"); }
+      | INV_GAMMA_PDF
+        { $$ = new string("4"); }
       | INV_GAMMA1_PDF
         { $$ = new string("4"); }
       | UNIFORM_PDF
diff --git a/preprocessor/DynareFlex.ll b/preprocessor/DynareFlex.ll
index 39cdf3b7afa6d4f308833a5c3a6ecf4e5624a0c3..1ba08c1abddd8e7173d546919fcec83f95811951 100644
--- a/preprocessor/DynareFlex.ll
+++ b/preprocessor/DynareFlex.ll
@@ -239,7 +239,7 @@ int sigma_e = 0;
 <DYNARE_BLOCK>gamma_pdf {return token::GAMMA_PDF;}
 <DYNARE_BLOCK>beta_pdf {return token::BETA_PDF;}
 <DYNARE_BLOCK>normal_pdf {return token::NORMAL_PDF;}
-<DYNARE_BLOCK>inv_gamma_pdf {return token::INV_GAMMA1_PDF;}
+<DYNARE_BLOCK>inv_gamma_pdf {return token::INV_GAMMA_PDF;}
 <DYNARE_BLOCK>inv_gamma1_pdf {return token::INV_GAMMA1_PDF;}
 <DYNARE_BLOCK>inv_gamma2_pdf {return token::INV_GAMMA2_PDF;}
 <DYNARE_BLOCK>uniform_pdf {return token::UNIFORM_PDF;}